Symptom: Bad Breath – Why does my pet have bad breath?
What signs will I notice if my pet has bad breath?
If your pet has noticeably bad breath, it could be more than just an unpleasant smell. Bad breath can be caused by dental disease, infections, or other underlying health issues.
Bad Breath (called halitosis), can manifest as a foul or unpleasant odour from the mouth, and can be accompanied by other signs:
Tartar on the teeth, red gums, excessive drooling, loose teeth
Other potential symptoms such as dropping food, chewing on one side of the mouth, or a reduced eating
Other signs may be present if there is a more systemic cause for the bad breath
Written by Dr. Mariella Roberts, Veterinary Surgeon, Animal Trust Vets CIC | Published October 2025 | Review date October 2028 | This advice is for UK pets only and is not a replacement for seeing a vet
Frequently asked questions
What are the common reasons for my pet to have bad breath?
- Dental disease
Related reading: Dental disease in cats, Dental disease in dogs
- Systemic illnesses such as kidney disease, liver disease, diabetes
Related reading: Diabetes in cats, Diabetes in dogs
- Foreign objects stuck in the mouth or throat
- Your pet ate something toxic or unpleasant
- Mouth tumours or lip fold infections
DOs - My pet has bad breath, what to do at home:
- Regularly brushing your pet’s teeth with a specific toothbrush and toothpaste for pets
- Dental chews and toys
- Feed your pet a balanced diet that supports overall health, including dental health
- Schedule regular veterinary check-ups to identify any underlying health conditions that might be contributing to bad breath
DON'Ts - My pet has bad breath, what not to do at home:
- Don’t use human toothpaste as it can be toxic for pets
- Don’t give sugary treats
- Don’t assume it is normal, especially in older pets
- Don’t delay veterinary visits
When should I think about going to the vet if my pet has bad breath?
- If your pet has red gums or tartar on his/her teeth
- If your pet is showing signs of mouth pain, such as chewing on one side or pawing at his/her mouth.
- If your pet’s face is swollen
- If your pet has other changes or signs of systemic illness, such as drinking more than normal, losing weight etc
- If you can see obvious lumps or discharges in the mouth