The Walking ClubShort 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.
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.
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.
Do not try to cover the smell with products and do not wait. A smell is a sign of something, not the problem itself.
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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This guide does not cover medical care. It is background on clear, calm handling at home.
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