Short answer: first decide whether this is new. A dog who suddenly eats much less, or who seems unwell, should see a vet. A dog who has always been fussy is a different problem.
PDSA says a dog who is not eating properly may be unwell and that you should contact your vet. The AKC lists many possible causes for a dog who stops eating and says to know when to call the vet.
The AKC says some dogs prefer to eat at certain times of day, and that a consistent pattern is often nothing to worry about if your dog eats enough and keeps a healthy weight. It also says mealtime is part of the household routine, and some dogs eat more comfortably when family members are around. See how much to feed and eating only when hand-fed.
If you change foods, do it slowly, as in changing food.
Ask your vet about your dog's weight and a feeding plan.
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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