Periodontal Disease in Dogs and Cats: Symptoms, Stages, and What to Expect

When your distinguished gentleman or goofy good girl greets you with welcome-home kisses, do you turn your head away? Sure, dog and cat breath isn’t pleasant, but it shouldn’t be actively bad either. Bad breath could be the first sign that there’s a problem.

Periodontal disease, an infection of the gums and supporting structures of the teeth, is the most common health condition veterinarians diagnose in dogs and cats, yet many pet owners have never heard of it. According to the World Small Animal Veterinary Association, 80% of dogs and 70% of cats develop some form of periodontal disease by two years of age. Left untreated, it causes chronic pain, tooth loss, and can even damage the heart, kidneys, and liver.

The good news: caught early, it's manageable. Stage 1 is even fully reversible.

What Is Periodontal Disease in Dogs and Cats?

Periodontal disease is and infection and inflammation of the tissues that surround and support the teeth: the gums (gingiva), the periodontal ligament, the cementum, and the alveolar bone. When those structures break down, teeth loosen, become infected, and eventually fall out.

It starts with plaque: a sticky, bacteria-laden film that forms on tooth surfaces within 24 hours of brushing. That brownish-yellow crust you see building up on your dog's teeth is tartar, the hardened form of old plaque. Tartar looks bad and harbors bacteria, but it's the plaque hiding beneath the gumline that does the real damage. Bacteria in subgingival plaque trigger an immune response, and that ongoing inflammation breaks down bone and ligament over time.

If left untreated, gingivitis (inflammation confined to the gums) progresses to periodontitis (destruction of the deeper supporting structures). According to the Merck Veterinary Manual, untreated periodontal disease carries systemic consequences, including an increased risk of chronic kidney disease, as well as links to cardiac and liver disease. This is why understanding what dental disease costs, both financially and medically, matters well before symptoms appear.

Signs of Periodontal Disease in Dogs and Cats

Periodontal disease often causes no obvious symptoms early on, which is why many dog dental disease symptoms go unnoticed until the condition has progressed. Dogs and cats are instinctively good at masking pain, so a pet with significant gum disease may appear to eat, play, and behave completely normally. Visible warning signs include:

• Bad breath beyond normal "dog breath"

• Red, swollen, or bleeding gums, especially near the cheeks

• Visible brownish-yellow tartar on the teeth

• Loose or missing teeth

• Drooling, or oral ulcers in the mouth

Behavioral signs are equally important:

• Chewing only on one side of the mouth

• Dropping food while eating or taking longer to finish meals

• Reluctance to pick up toys or chew on favorite chews

• Pawing at the mouth, or a pickier appetite than usual

Roughly 40% of dental disease occurs below the gumline, where it's invisible without X-rays. A pet with clean-looking teeth can still have significant bone loss and infection beneath the surface. Many pet parents turn down a dental because their pet’s teeth look clean on the surface. Once they see the dental X-ray evidence, they are shocked and surprised at what is going on where they can’t see. If you notice any of the signs above, schedule a veterinary checkup. Loose or missing teeth are often the first visible sign that disease has already reached an advanced stage.

The 4 Stages of Periodontal Disease in Dogs

Staging can only be determined under anesthesia with full-mouth dental X-rays and hands-on probing. Not all teeth in a pet's mouth may be at the same stage simultaneously, which is exactly why a full-mouth exam is needed.

Stage 1: Gingivitis is the only stage that is fully reversible. No permanent structural damage has occurred yet. A professional cleaning and consistent home care can return the gums to full health.

Stage 2: Early Periodontitis marks the point where disease has crossed into actual bone loss. Subgingival scaling can stop further progression, but bone that's already lost doesn't return.

Stage 3: Moderate Periodontitis involves 25-50% loss of the tooth's supporting structures. Some teeth may be saved with advanced periodontal procedures and rigorous daily home care; for most, extraction is the more humane choice.

Stage 4: Advanced Periodontitis means more than half the supporting bone is gone. Every tooth at this stage must be extracted. Most dogs and cats feel dramatically better within days of treatment because the chronic source of pain has been removed.

Periodontal Disease in Cats: What's Different

Cats develop periodontal disease through the same mechanism as dogs: plaque accumulation leading to gum inflammation and bone loss. But cats are even better at masking pain. A cat with significant dental disease may groom less, become quieter, or gradually shift to softer food, changes easily mistaken for normal aging.

Tooth resorption is a condition far more common in cats than dogs, and it often develops alongside periodontal disease. The tooth structure breaks down from the inside out, beginning at the gumline. Affected teeth become extremely painful and cannot be repaired; extraction is the only treatment. Dental X-rays are the only reliable way to diagnose it.

Adult cats have 30 teeth, and most adapt quickly after extractions, often eating better than before once the pain is gone.

What Happens at a Dental Cleaning

The terms "dental," "dental cleaning," "dental prophy," and "COHAT" (Comprehensive Oral Health Assessment and Treatment) all refer to essentially the same procedure: a professional cleaning performed under general anesthesia. This process is how veterinarians treat periodontal disease in dogs, addressing both visible tartar and the infection below the gumline.

Anesthesia is non-negotiable. The real work happens below the gumline, and a pet cannot hold still for probing, subgingival scaling, and full-mouth X-rays while awake. Any cleaning performed without anesthesia can only address visible tartar above the gumline and cannot diagnose or treat the disease beneath it.

A complete dental procedure typically includes pre-anesthetic bloodwork, IV catheter placement, full-mouth dental X-rays (required to detect bone loss and root disease invisible on surface exam), scaling above and below the gumline, periodontal probing of every tooth, polishing, and extractions if needed.

Extractions are often what owners worry most about, but adult dogs have 42 teeth and adult cats have 30, and losing a few diseased ones rarely affects eating once they have healed. The mouth of a dog or cat is remarkably resilient; most could manage dry food with few or no teeth. Many pets eat better after a dental because the chronic pain has finally been resolved. That level of care is reflected in the cost of dental cleaning, which varies depending on what’s found and treated.

Dental Cleaning Aftercare

Most pets go home the same day. Drowsiness and mild disorientation are normal for the first 12-24 hours. Wait until your pet is fully awake before offering food, and start with a smaller meal than usual. Soft food is recommended for 7-10 days if extractions were performed; any sutures in the mouth are dissolvable.

Give all prescribed medications exactly as directed. Call your veterinarian if you notice excessive bleeding, drooling beyond 24 hours, refusal to eat after the first day home, or facial swelling. Most pets recover within 24-48 hours; those with extractions typically within 7-10 days.

How to Prevent Periodontal Disease

Daily tooth brushing is the single most effective home prevention. It physically disrupts plaque before it can mineralize into tartar. Use only dog- or cat-specific toothpaste; human toothpaste often contains xylitol, which is toxic to pets. Learning how to brush your pet’s teeth properly is an important part of being a responsible pet parent.

VOHC-approved products (dental chews, water additives, and prescription dental diets evaluated by the Veterinary Oral Health Council) can help between brushings but don't replace professional cleanings.

Professional cleanings every 6-12 months are the cornerstone of prevention. Small breeds and brachycephalic breeds (Yorkshire Terriers, Dachshunds, Chihuahuas, Pugs, Bulldogs, French Bulldogs) typically need cleanings every 6 months starting by age 2, as their crowded teeth accumulate plaque faster.

The Cost of Dental Disease and How Pet Insurance Helps

Dental care can be a significant expense, especially when problems develop under the surface. Understanding the typical costs can help you plan and avoid surprises. Periodontal disease treatment costs vary based on what's found once your pet is under anesthesia, but most dog dental cleaning costs fall within the following ranges:

• Routine dental cleaning (no extractions): $300–$700

• Cleaning with extractions: $700–$1,300+ depending on how many teeth are removed

• Advanced periodontal treatment (Stages 3–4 or specialist care): $1,000–$3,000+

Dental coverage varies widely across insurance providers. Pet dental insurance is covered through Embrace’s dog insurance and cat insurance plans. Embrace's standard accident and illness policy covers periodontal disease and gingivitis up to $1,000 per policy term, as well as broken or fractured teeth and other dental accidents and illnesses. Dental care can get expensive quickly, especially when disease isn’t caught early. A wellness plan can help you budget for routine expenses like this by spreading out the cost of regular care, including cleanings, exams, and follow-up visits.

As of 2025, the American Animal Hospital Association Dental Care Guidelines recommend annual professional oral examinations and cleanings under anesthesia for all dogs and cats, with more frequent intervals for high-risk breeds.