Periodontitis in Dogs and Cats: Causes, Signs, Stages, Treatment & Prevention

Quick Answer: What Is Periodontitis in Dogs and Cats?

Periodontitis in dogs and cats is a progressive dental disease that damages the tissues supporting the teeth, including the gums, periodontal ligament, cementum and alveolar bone. It usually begins with plaque and gingivitis; when inflammation progresses into deeper tissues and causes attachment or bone loss, it becomes periodontitis. Unlike gingivitis, which is reversible, periodontitis causes permanent damage and can lead to chronic oral pain, tooth loss and other health concerns.

Early veterinary dental examinations, professional cleaning when indicated, and consistent home care—especially daily toothbrushing—are the foundation of prevention and long-term oral health.

Key Takeaways

• Periodontal disease is extremely common in dogs and cats and becomes more likely with age.
• Gingivitis is reversible; periodontitis is not.
• Much of a tooth and its supporting structures are below the gumline, so significant disease may not be visible to owners.
• Small and toy dog breeds, older pets and animals with crowded teeth have increased risk.
• Professional dental assessment and cleaning under general anaesthesia allow veterinarians to examine and treat areas that cannot be properly evaluated in an awake pet.
• Daily toothbrushing is one of the most effective forms of home dental care.
• “Anaesthesia-free” dental scaling is not considered an adequate substitute for comprehensive veterinary dental care by major veterinary dental organizations.

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What Is Periodontal Disease, and How Is It Different From Gingivitis?

The periodontium is the support system surrounding each tooth. It includes the gingiva (gums), periodontal ligament, cementum covering the tooth root and alveolar bone.

Periodontal disease is the broader term for inflammation and damage affecting these structures. It generally progresses through two important stages:

1. Gingivitis

Gingivitis is inflammation limited primarily to the gums.

Common features include:

• Red or swollen gums
• Plaque accumulation
• Possible bleeding
• No loss of periodontal attachment
• Reversible with appropriate treatment and home care

2. Periodontitis

Periodontitis occurs when inflammation extends into the deeper supporting tissues.

This can result in:

• Loss of periodontal ligament attachment
• Loss of alveolar bone
• Formation of periodontal pockets
• Tooth mobility
• Tooth loss
• Permanent structural damage

Once periodontal attachment and supporting bone have been lost, the damage generally cannot simply be reversed. Treatment focuses on controlling the disease, preserving healthy structures where possible and preventing further progression.

How Does Periodontal Disease Start?

The process begins when a thin biofilm of bacteria, salivary proteins and food debris—known as plaque—forms on the teeth.

If plaque is not adequately removed, it can mineralize into calculus, commonly called tartar. Calculus creates a rough surface that allows additional plaque to accumulate.

The inflammatory response generated by the pet's own immune system plays a major role in the destruction of periodontal tissues.

As periodontal disease progresses, the bacterial community within the mouth also changes, with disease-associated bacteria becoming increasingly prevalent.

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How Common Is Periodontal Disease in Dogs and Cats?

Periodontal disease is consistently reported as one of the most common clinical conditions affecting companion animals.

The prevalence varies between studies because researchers use different examination methods, scoring systems and diagnostic techniques, particularly whether dental radiographs are included.

Risk generally increases with:

• Age
• Smaller body size
• Certain breeds
• Crowded teeth
• Malocclusion
• Lack of regular dental care

Small and toy breeds are particularly vulnerable because their teeth can be relatively large compared with the size of their jaws, creating areas where plaque can accumulate.

Importantly, owners cannot see everything that is happening below the gumline. A pet may therefore have substantial periodontal disease despite appearing to have only mild visible tartar.

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Stages of Periodontal Disease in Dogs and Cats

Veterinarians assess periodontal disease using clinical examination and, when appropriate, dental radiographs. The disease is staged for individual teeth according to the amount of periodontal attachment loss.

A pet can have different stages affecting different teeth, which is why veterinarians evaluate and chart individual teeth during a comprehensive dental examination.

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What Causes Periodontal Disease in Dogs and Cats?

Plaque is the initiating factor, but several characteristics influence how quickly periodontal disease develops.

Breed and Size

Small and toy dog breeds—including Yorkshire Terriers, Dachshunds, Toy Poodles and Chihuahuas—can be particularly susceptible because of tooth crowding and jaw anatomy.

Age

The longer a pet is exposed to plaque accumulation, the greater the opportunity for periodontal disease to develop.

Dental Crowding and Malocclusion

Closely positioned teeth and abnormal tooth alignment can create difficult-to-clean areas where plaque accumulates.

Diet and Chewing Behaviour

Food texture and mechanical abrasion can influence plaque and calculus accumulation, although diet alone should not be considered a replacement for brushing or professional dental care.

Lack of Home Dental Care

Without regular plaque removal, periodontal disease can progressively worsen.

Daily toothbrushing is particularly effective because it physically disrupts plaque before it becomes more established.

Systemic Disease

Certain systemic conditions can increase susceptibility to oral disease or complicate its management.

In cats, conditions such as FeLV, FIV, diabetes and other health problems may be relevant depending on the individual animal.

Additional Feline Dental Problems

Cats can experience periodontal disease alongside conditions such as tooth resorption and stomatitis, making feline oral disease particularly complex.

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Signs of Periodontitis in Dogs and Cats

Pets often hide oral discomfort surprisingly well.

Watch for:

• Persistent bad breath
• Yellow or brown tartar
• Red or bleeding gums
• Excessive drooling
• Blood-tinged saliva
• Dropping food
• Chewing on one side of the mouth
• Preferring soft food
• Pawing at the face
• Reluctance to have the mouth touched
• Loose or missing teeth
• Facial swelling
• Swelling beneath the eye
• Weight loss
• Changes in eating habits
• Irritability or behaviour changes
• Poor grooming in cats

Is Bad Breath Always a Sign of Dental Disease?

Not every case of bad breath has the same cause, but persistent halitosis is one of the most common early clues that a pet needs an oral examination.

Do not wait until your pet stops eating. By that point, oral disease may already be advanced.

For other changes in appetite, behaviour and comfort that may need veterinary attention, read our pet health warning signs guide.

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Why Does Periodontitis Matter?

Periodontal disease can cause significant local damage inside the mouth.

Local Effects

Advanced disease may result in:

• Chronic oral pain
• Tooth loss
• Periodontal pockets
• Tooth-root infections
• Oronasal fistulae
• Jaw weakening
• Difficulty eating

Severe periodontal bone loss can even contribute to pathological jaw fractures in some small dogs.

Possible Effects Beyond the Mouth

Researchers have investigated relationships between periodontal disease and systemic health.

Studies have reported associations between periodontal disease and changes involving organs such as the:

• Heart
• Kidneys
• Liver

There is an important distinction, however: an association does not prove that periodontal disease directly causes disease in another organ.

Age, breed, systemic illness and other shared risk factors may contribute to these relationships.

Nevertheless, the evidence supports treating oral health as an important component of overall veterinary care.

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How Do Veterinarians Diagnose Periodontitis?

A thorough periodontal assessment cannot be performed properly by simply looking at an awake pet's teeth.

Veterinary dental guidelines recommend a Comprehensive Oral Health Assessment and Treatment (COHAT) when appropriate.

Depending on the patient's condition, this can include:

1. Pre-Anaesthetic Assessment

The veterinarian evaluates the pet's overall health and determines whether blood work or additional testing is appropriate.

2. General Anaesthesia

General anaesthesia allows the veterinary team to perform a complete oral examination while protecting the airway with an appropriate endotracheal tube.

3. Dental Charting

Each tooth is evaluated for:

• Periodontal probing depth
• Mobility
• Gum condition
• Attachment loss
• Other abnormalities

4. Full-Mouth Dental Radiographs

Dental X-rays are extremely important because disease below the gumline cannot be adequately assessed through visual inspection alone.

Radiographs can reveal:

• Bone loss
• Tooth-root disease
• Tooth resorption
• Hidden infections
• Other structural abnormalities

5. Professional Dental Cleaning

Plaque and calculus are removed both above and below the gumline, followed by polishing.

6. Treatment

Depending on the disease stage, treatment may include:

• Periodontal therapy
• Root planing
• Extraction of unsalvageable teeth
• Advanced dental procedures by a veterinary dental specialist when appropriate

7. Home-Care Plan

The veterinarian should provide an individualized plan for maintaining oral health after treatment.

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How Is Periodontal Disease Treated?

Treatment depends on the severity of disease and the condition of individual teeth.

PD1 — Gingivitis

Treatment generally focuses on professional plaque and calculus removal followed by consistent home dental care.

Because there is no attachment loss, gingivitis can generally be reversed when appropriately managed.

PD2–PD3 — Early to Moderate Periodontitis

Treatment may include:

• Professional scaling
• Subgingival cleaning
• Root planing
• Periodontal therapy
• Extraction of teeth with severe attachment loss

Some teeth may be preserved using advanced periodontal procedures performed by a suitably trained veterinary dental professional.

PD4 — Advanced Periodontitis

Severely affected teeth often require extraction.

Although many owners worry that their pet will struggle without teeth, dogs and cats generally adapt very well after diseased teeth are removed and may actually eat more comfortably.

Do Antibiotics Cure Periodontitis?

No. Antibiotics alone do not treat the underlying cause of periodontitis.

They may be appropriate in selected clinical situations, but controlling periodontal disease requires removal or treatment of diseased structures and effective plaque control.

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Why “Anaesthesia-Free” Dental Cleaning Is Not a Substitute

Some services advertise dental scaling without anaesthesia.

Major veterinary dental organizations do not consider this an adequate replacement for comprehensive veterinary dental care.

An awake pet generally cannot safely undergo:

• Complete periodontal probing
• Full-mouth dental radiography
• Thorough subgingival cleaning
• Treatment of painful diseased teeth
• Extraction of teeth that require removal

A tooth can therefore appear cleaner above the gumline while significant disease continues underneath it.

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How to Prevent Periodontal Disease in Dogs and Cats

Prevention is much easier than treating advanced periodontal disease.

1. Brush Your Pet's Teeth Daily

Daily toothbrushing is the gold standard for home plaque control.

Use:

• A pet-specific toothbrush
• Pet-safe toothpaste

Never use human toothpaste containing ingredients that may be unsafe for pets, including xylitol.

Introduce brushing gradually and make the experience positive.

For more background on daily canine dental care, see why oral health and dental care matter for your dog.

2. Choose Evidence-Based Dental Products

Look for products accepted by the Veterinary Oral Health Council (VOHC).

VOHC acceptance is based on submitted evidence regarding plaque or calculus control.

Dental products can complement brushing, but they should not automatically be treated as a replacement for brushing or veterinary dental care.

3. Consider Dental Diets

Some specially formulated dental diets use food structure and mechanical action to help reduce plaque and calculus.

Ask your veterinarian whether a dental diet is appropriate for your pet.

4. Schedule Regular Veterinary Dental Checks

At minimum, pets should have their mouths examined regularly as part of routine veterinary care.

Some animals—particularly small breeds and pets with previous periodontal disease—may need more frequent examinations.

Your veterinarian should determine the appropriate interval based on:

• Age
• Breed
• Oral-health history
• Existing disease
• Home-care routine

5. Avoid Extremely Hard Chews

Very hard objects such as:

• Bones
• Antlers
• Extremely hard nylon chews

can fracture teeth.

A practical rule often used in veterinary dental discussions is that if an object is so hard you cannot make an indentation with your fingernail, it may be too hard for your pet's teeth.

For supervised enrichment rather than hard chewing, explore the 24-hole interactive dog treat puzzle. This is a food puzzle, not a chew toy or a treatment for periodontal disease. Use only when your pet can eat comfortably and your veterinarian agrees the food and activity are appropriate; do not let your pet chew the puzzle.

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Frequently Asked Questions

Can Periodontitis in Dogs and Cats Be Reversed?

Gingivitis can be reversed, but periodontitis cannot generally be reversed once periodontal attachment and supporting bone have been lost. Professional treatment and daily home care can, however, control the disease and help prevent further progression.

What Are the First Signs of Gum Disease in a Dog or Cat?

Persistent bad breath is often one of the first noticeable signs, followed by red or bleeding gums and visible tartar. Some pets show very few behavioural changes even when significant disease is present.

Is Periodontal Disease Painful for Dogs and Cats?

Yes. Periodontal disease can be painful, although dogs and cats often hide signs of oral discomfort. Many owners notice improvements in eating, activity and behaviour after appropriate dental treatment.

How Often Should My Pet Have a Dental Cleaning?

There is no single schedule that is appropriate for every pet. The recommended interval depends on age, breed, oral-health status and previous dental disease. Some pets may require professional care every 6–12 months, while others may need a different schedule determined by their veterinarian.

Can Periodontal Disease Kill a Dog or Cat?

Periodontal disease is not usually considered a direct cause of death, but advanced disease can cause significant pain, infection and tooth loss and has been associated with systemic health changes. Maintaining good oral health is therefore an important part of long-term preventive care.

How Much Does Periodontal Disease Treatment Cost?

Treatment costs vary considerably depending on location, veterinary clinic, disease severity, dental radiographs, extractions and other procedures.

Ask your veterinarian for a written estimate before treatment.

Preventive dental care is generally less expensive than treating advanced periodontal disease.

Are Dental Treats Enough to Prevent Periodontal Disease?

No. Some dental treats and diets can help reduce plaque or calculus, particularly products supported by appropriate evidence, but they do not replace daily brushing and professional veterinary dental care.

Can a Pet Have Severe Dental Disease Without Obvious Symptoms?

Yes.

Dogs and cats can hide oral pain, and much of periodontal disease occurs below the gumline.

That is why regular veterinary oral examinations are important even when your pet appears to be eating normally.

Do Dogs and Cats Need Anaesthesia for a Proper Dental Cleaning?

A comprehensive veterinary dental procedure generally requires general anaesthesia so the veterinarian can safely examine, probe, radiograph and clean the teeth, including areas below the gumline.

Your veterinarian will assess the individual patient's health and anaesthetic risk before the procedure.

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When Should You Take Your Pet to the Veterinarian?

Schedule a veterinary dental examination if your dog or cat has:

• Persistent bad breath
• Red or bleeding gums
• Heavy tartar
• Difficulty eating
• Dropping food
• Loose teeth
• Facial swelling
• Excessive drooling
• Mouth pain
• Changes in eating behaviour

Seek prompt veterinary attention if your pet stops eating, particularly a cat, because prolonged food refusal can lead to serious complications.

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The Bottom Line

Periodontitis is common, painful and largely preventable.

The most effective approach combines:

Regular veterinary dental examinations + professional dental treatment when needed + daily home plaque control.

Do not rely on the appearance of your pet's teeth alone. Disease can develop beneath the gumline before obvious symptoms appear.

If your dog or cat has persistent bad breath, bleeding gums, difficulty eating or other signs of oral discomfort, schedule a veterinary dental examination.

And if your pet's veterinarian recommends starting a daily brushing routine, start gradually and make it a consistent part of your pet's normal care.

Healthy teeth aren't just about a better-looking smile—they're part of your pet's comfort and long-term wellbeing.

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Veterinary Disclaimer

This article is provided for general educational purposes and does not replace examination, diagnosis or treatment by a licensed veterinarian. Dental disease can vary considerably between individual pets. Always consult your veterinarian for advice specific to your dog's or cat's health, dental condition and treatment needs.

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References

Clinical Guidelines

1. Bellows J, Berg ML, Dennis S, et al. 2019 AAHA Dental Care Guidelines for Dogs and Cats. J Am Anim Hosp Assoc. 2019;55(2):49–69.
2. Niemiec B, Gawor J, Nemec A, et al. World Small Animal Veterinary Association Global Dental Guidelines. J Small Anim Pract. 2020;61(7):395–403.
3. American Veterinary Dental College. Periodontal disease position and staging resources.
4. Veterinary Oral Health Council. Accepted products and protocols.

Textbooks

5. Niemiec BA. Veterinary Periodontology. Wiley-Blackwell; 2013.
6. Verstraete FJM, Lommer MJ. Oral and Maxillofacial Surgery in Dogs and Cats. Saunders Elsevier; 2012.

Prevalence and Risk Factors

7. Lund EM, Armstrong PJ, Kirk CA, et al. Health status and population characteristics of dogs and cats examined at private veterinary practices in the United States. J Am Vet Med Assoc. 1999;214(9):1336–1341.
8. Wallis C, Holcombe LJ. A review of the frequency and impact of periodontal disease in dogs. J Small Anim Pract. 2020;61(9):529–540.
9. Wallis C, Pesci I, Colyer A, et al. A longitudinal assessment of periodontal disease in 52 Miniature Schnauzers. BMC Vet Res. 2019;15:406.
10. Wallis C, Saito EK, Salt C, et al. Association of periodontal disease with breed size, breed, weight, and age in pure-bred client-owned dogs in the United States. Vet J. 2021;275:105717.
11. Kortegaard HE, Eriksen T, Baelum V. Periodontal disease in research Beagle dogs: an epidemiological study. J Small Anim Pract. 2008;49(12):610–616.
12. Stella JL, Bauer AE, Croney CC. A cross-sectional study to estimate prevalence of periodontal disease in a population of dogs in commercial breeding facilities in Indiana and Illinois. PLoS One. 2018;13(1):e0191395.
13. Harvey CE. Periodontal disease in dogs: etiopathogenesis, prevalence, and significance. Vet Clin North Am Small Anim Pract. 1998;28(5):1111–1128.
14. Niemiec BA. Periodontal disease. Top Companion Anim Med. 2008;23(2):72–80.
15. Riggio MP, Lennon A, Taylor DJ, Bennett D. Molecular identification of bacteria associated with canine periodontal disease. Vet Microbiol. 2011;150(3–4):394–400.
16. Perry R, Tutt C. Periodontal disease in cats: back to basics, with an eye on the future. J Feline Med Surg. 2015;17(1):45–58.

Systemic Associations

17. Glickman LT, Glickman NW, Moore GE, et al. Evaluation of the risk of endocarditis and other cardiovascular events on the basis of the severity of periodontal disease in dogs. J Am Vet Med Assoc. 2009;234(4):486–494.
18. DeBowes LJ, Mosier D, Logan E, et al. Association of periodontal disease and histologic lesions in multiple organs from 45 dogs. J Vet Dent. 1996;13(2):57–60.
19. Pavlica Z, Petelin M, Juntes P, et al. Periodontal disease burden and pathological changes in organs of dogs. J Vet Dent. 2008;25(2):97–105.
20. Rawlinson JE, Goldstein RE, Reiter AM, et al. Association of periodontal disease with systemic health indices in dogs and the systemic response to treatment of periodontal disease. J Am Vet Med Assoc. 2011;238(5):601–609.
21. Finch NC, Syme HM, Elliott J. Risk factors for development of chronic kidney disease in cats. J Vet Intern Med. 2016;30(2):602–610.

Prevention and Diet

22. Gorrel C, Rawlings JM. The role of tooth-brushing and diet in the maintenance of periodontal health in dogs. J Vet Dent. 1996;13(4):139–143.
23. Logan EI. Dietary influences on periodontal health in dogs and cats. Vet Clin North Am Small Anim Pract. 2006;36(6):1385–1401.
24. Gawor JP, Reiter AM, Jodkowska K, et al. Influence of diet on oral health in cats and dogs. J Nutr. 2006;136(7 Suppl):2021S–2023S.