Dog's stomach's are definitely not as fragile as ours. Dogs eat grass regularly, as well as eating pretty much anything that they can get their paws onto. To remain healthy, however, dogs should be fed a small amount in the morning and a small amount at night. Their food can consist of canned food, dry food, or both, but beware that canned food can be fattening.
Beware that dogs should never be fed people food, regardless of how cute they are and how much they beg. You are not doing them any good as it is not healthy for them.
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More puppy mill information
Some basic information
Exercising your pet
Grooming information
Dog sitting information
Training your dog