Dog bad breath: causes and treatment

Mild doggy breath is normal, but breath that is truly foul — rotting, fishy, sweet/fruity, or ammonia-like — signals an underlying problem that needs attention.

Dental disease is the #1 cause

By age 3, over 80% of dogs have some degree of periodontal disease. Bacteria form plaque and tartar on the teeth, infecting the gums and eventually the bone beneath. The result is a persistent, putrid odour. Other signs include red or bleeding gums, difficulty chewing, drooling, and pawing at the mouth.

Other oral causes

- Broken tooth (exposed pulp becomes infected)
- Oral tumour or growth
- Something stuck between the teeth (bone fragment, stick)
- Stomatitis (severe gum inflammation)

Systemic causes — when breath signals a body problem

- Sweet or fruity smell: classic sign of diabetic ketoacidosis — a medical emergency if accompanied by vomiting, lethargy, or loss of appetite
- Ammonia/urine smell: kidney failure causes toxins to build up in the blood and be exhaled
- Foul smell plus yellowed gums or whites of eyes: liver disease

Treatment and prevention

- Daily tooth brushing with dog-specific enzymatic toothpaste is the gold standard
- Dental chews and water additives help but do not replace brushing
- Professional scaling under anaesthesia removes hardened tartar that brushing cannot reach
- Treat underlying disease if bad breath has a systemic cause

Flovvi lets you log vet visits and dental cleanings so you track when the next professional scale is due.