{ "@context": "https://schema.org", "@type": "BlogPosting", "headline": "Bad breath in a dog - what does it cause?", "description": "Does your dog's breath smell like pus or fish? It's not normal. Read about the most common causes (tartar, gingivitis, kidney failure) and how to get rid of the smell.", "datePublished": "Jan 27, 2026", }

Bad breath in a dog - what does it cause?

📞 Appointment for dental treatment: 010 739 9130

“It's just a dog's breath, it's supposed to smell.”

This is a dangerous myth. A healthy dog's breath does not smell like roses, but it should not smell like rot, sewage or carrion. A strong smell is always a sign of bacterial overgrowth or disease.

What is the origin of the smell and when should I be worried?

Reason # 1: Tartar and Gingivitis

More than 80% of dogs older than 3 years have some degree of periodontitis, an inflammation of the attachment tissue of the teeth.

  • Bacteria accumulate on the surface of the teeth into plaque and harden into tartar.
  • Bacteria that nest in the gum pockets produce sulphur gases that smell bad.
  • Treatment: Removal of tartar by a veterinarian and cleaning of the gingival pockets under anesthesia.

Other possible causes

If the dog's mouth is clean, but the smell is gruesome, the cause may be found elsewhere:

  • Foreign object: A stick or piece of bone stuck between the palate or teeth that rots.
  • Kidney failure: The smell of urine or ammonia in the breath may indicate kidney failure (uremia).
  • Diabetes: Sweet-smelling or acetone-smelling breath.
  • Tumors: Tumors in the mouth can become inflamed and smell bad.

Is it possible to remove the smell with home remedies?

Chewing bones and additives used in water can slightly freshen breath, but they do not eliminate the cause. If the smell is caused by tartar or inflammation, it will not go away without mechanical cleaning.

Do the test: Peep into the dog's mouth.

  1. Do the gums redden?
  2. Do you see brownish deposits on your teeth?
  3. Does the dog back off if you try to touch the mouth?

If you answered yes, it's time to book a vet appointment.

📍 Veterinary Hospital Sacrum — Porttisuontie 13, Vantaa

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