What an owner may notice
Blood may appear as bright red drops, pink saliva or darker stains on bedding. Sometimes the animal swallows the blood and looks "clean" from the outside, while you only notice an odour, drooling or a change in behaviour while eating.
- Saliva or discharge with blood mixed in
- Bleeding gums
- Blood on toys, paws or fur near the muzzle
- Excessive drooling
- The pet rubs its muzzle with a paw or avoids touch
- Eats or chews on only one side
- Refusal of hard food or treats
Why blood appears from the mouth
Most often the source is the mouth: gingivitis, periodontal disease, trauma or a fractured tooth, heavy plaque and tartar with inflammation, growths, and in cats also tooth resorption (TR) or chronic gingivostomatitis.
Sometimes blood may accompany systemic conditions. That is why the vet assesses not only the teeth but the animal's overall health. You cannot rule out a systemic cause at home.
Why appetite does not rule out pain
Dogs and cats often mask chronic oral pain. They may keep eating but change how they do it: refusing hard food, taking soft food from the bowl, or chewing on only one side. A normal appetite does not mean the teeth are not painful.
What is visible at a routine examination and what needs anaesthesia
At a visit without anaesthesia I can assess overall condition, visible saliva, accessible tooth and gum surfaces, swelling and behaviour. But a full examination of every tooth, subgingival areas and roots is only possible under anaesthesia.
Dental radiography helps reveal hidden changes: deep periodontal lesions, root disease, resorption and retained tooth fragments.
How treatment decisions are made
The plan depends on the source of bleeding: oral cavity sanitation following the COHAT protocol, periodontal therapy, endodontic treatment or tooth restoration (filling) where indicated, or extraction when preservation is impossible or inhumane.
When to see a vet
- There is blood or blood-tinged saliva from the mouth
- Swelling of the muzzle or the area under the eye
- A sharp change in behaviour while eating, or refusal of hard food
- Blood-tinged saliva is combined with lethargy or reduced appetite
What not to do at home
- Do not try to stop bleeding with human mouth rinses or gels
- Do not give human painkillers
- Do not chip off tartar or disturb loose teeth
- Do not delay an examination hoping the bleeding "went away on its own"
Frequently asked questions
Any blood-tinged saliva needs a prompt examination. How urgent it is depends on the amount of bleeding, swelling and overall condition. It is better to assess early than wait for deterioration.
Trauma is possible, but bleeding also occurs with gingivitis and periodontal disease. Even if a toy "caught" the gums, it is worth checking whether there is a deeper problem.
Some sources of bleeding lie under the gums or around the roots. A full examination under anaesthesia and dental radiographs help assess them.
Until you have veterinary advice, avoid very hard items the pet chews vigorously. It is best to agree a diet while waiting for the examination with the clinic.
Sources and professional guidelines
- WSAVA Global Dental GuidelinesGlobal guidelines on veterinary dentistry
- 2019 AAHA Dental Care Guidelines for Dogs and CatsClinical guidelines on dental care
- AVDC NomenclatureAVDC nomenclature and terminology
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