Like it's been said, try to feed the dog the same brand it normally eats. Generally we say put the food down for 30 minutes, and if it won't eat take it away. Try again at the next scheduled time. If it again won't eat, take the food after 30 minutes. It will eventually eat.
If you don't know what it eats normally and you're worried about changing foods, it's almost always alright to feed a dog plain white rice and boiled chicken (no bones!). Note, this diet willl help settle a sick dog's stomach aswell.
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