7 Signs Your Dog Has Dental Disease — and Most Owners Miss Them

Why dogs hide dental pain

In the wild, an animal that shows weakness or pain becomes a target. Dogs retain this instinct even in the safety of a home — a dog in dental pain will typically continue eating, playing, and behaving normally until the disease is quite advanced. This means you cannot rely on obvious distress signals to flag a dental problem. By the time a dog stops eating or visibly cries when chewing, the disease is often serious. The signs below are earlier and subtler — and far more useful for catching problems while they're still reversible.

The 7 signs

1. Bad breath that doesn't go away
Normal dog breath has a mild, neutral smell. Persistent bad breath — described by owners as fishy, rotten, or "like garbage" — is one of the earliest and most reliable indicators of bacterial infection in the mouth. The smell comes from volatile sulphur compounds produced by bacteria metabolising plaque proteins. This is not normal and should not be dismissed as "just dog breath." 2. Yellow or brown buildup on teeth
White teeth are healthy teeth. Yellowing at the gumline is early tartar (calculus) formation. Brown or dark yellow crusty buildup, particularly on the upper back teeth and lower front teeth, indicates significant tartar that requires professional removal. This is visible with a simple lip lift — check your dog's teeth monthly. 3. Red, swollen, or bleeding gums
Healthy gums are pale pink and firm, with a clear margin where they meet the tooth. Red, puffy, or inflamed gums (gingivitis) indicate bacterial infection. Gums that bleed when you touch them or when your dog chews are already significantly inflamed. This is the reversible stage — catch it here. 4. Dropping food or chewing on one side
A dog that drops food they'd normally eat eagerly, or that consistently tilts their head to chew on one side, is telling you that something in their mouth hurts. This is a pain behaviour, not a food preference. 5. Pawing at the mouth or face
Occasional face-touching is normal. Repeated pawing at the mouth or rubbing the face along furniture or carpet often indicates oral discomfort or pain — sometimes from a specific tooth, sometimes from general gum inflammation. 6. Reluctance to chew toys they previously enjoyed
A dog that used to love chew toys or dental chews and now avoids them entirely may have developed mouth pain. This is easy to dismiss as the dog simply "getting bored" of a toy — but a sudden change in chewing behaviour warrants a dental check. 7. Changes in social behaviour around the face
Some dogs with dental pain become reluctant to be touched around the face and head. A dog that was previously happy to have their face and muzzle handled and now pulls away or shows discomfort may be guarding a painful mouth.

What to do if you notice these signs

If you notice one or more of these signs, especially bad breath combined with visible tartar or red gums, book a vet examination promptly — not at the next routine annual visit, but within the next few weeks. Mention specifically that you've noticed dental symptoms and want a dental assessment. Many routine examinations include only a brief visual check of the teeth — a proper dental assessment with periodontal probing and X-rays requires anaesthesia and is a separate procedure. For signs 4, 5, 6, or 7 — food dropping, one-sided chewing, pawing at mouth, or facial guarding — treat these as pain signals that warrant prompt attention rather than watchful waiting.

Monthly home check — what to look for

Build a brief monthly dental inspection into your routine. It takes less than two minutes and can catch problems months before they become serious. Gently lift the lips on both sides and check:

• Gum colour: Should be pale pink, not red or white
• Gum margin: Should be tight against the tooth, not puffy or receded
• Tooth colour: White to light yellow is normal; significant yellowing or brown buildup is not
• Loose teeth: Touch each visible tooth gently — they should be firm
• Missing teeth: Keep a mental note so you can identify changes

If anything looks different from last month, book a vet check. You do not need to diagnose the problem — that's the vet's job. Your job is to notice the change.