Short answer: a strong or sudden smell is worth a vet check. VCA says the most common cause of bad breath in dogs is gum disease from plaque and tartar build-up.
What VCA says
VCA says halitosis can have several causes, including food trapped in pockets around the teeth, and that the most common cause is periodontal disease arising from plaque and tartar. Your vet can look at the teeth and decide on a cleaning or other care.
What to do
Book a vet check, especially if the smell is new or strong. Our guide on dental care basics covers day-to-day care, and first toothbrush shows how to teach tooth brushing slowly with rewards.
What not to do
Do not try to cover the smell with products and do not wait. A smell is a sign of something, not the problem itself.
Get the right help
Your vet can tell you whether the cause is in the mouth or elsewhere.
This article is general education, not veterinary advice. If your dog seems unwell, is in pain, or something changed suddenly, call your vet. If it could be an emergency, do not wait.
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Sources
Sources & care notes
Frequently asked questions
Why does my dog's breath smell bad?
The most common cause is gum disease that builds up from plaque and tartar, though several causes are possible.
When should I book a vet visit?
Whenever the smell is strong or new. The vet can look in the mouth and find what is behind it.
What should I not do?
Do not cover the smell with products and do not wait it out. A smell is a sign of something, not the problem itself.
What does daily care look like?
Tooth brushing taught slowly with rewards, plus a dental routine your vet agrees with.
