Why do puppies suddenly stop eating as much?

Like children, puppies can go on and off food. They may simply not like the food you are giving them and ALL dogs love people food! They aren't stupid. LOL I have two dogs and they know they have to eat their dinner before getting that little piece of chicken or beef or a veggie. We DO NOT feed our pets from our plates, but we do save a little chicken or beef and then when the plates are ready to be washed I'll put the bits of meat into their bowls. Slowly introduce your puppy onto a different brand of food (FOR PUPPIES) which can be bought at any pet store. Get a small bag of dry food and some tins of food. Puppies need very little food (depending on the breed) so ask the person in the pet store how much you should feed the puppy after you tell them what type of breed the dog is. There is a great different from a Cockapoo (small breed) and a Lab pup. Of course the Lab pup is going to need a little more food. If this doesn't work then it's time to see your vet.
Like children, puppies can go on and off food. They may simply not like the food you are giving them and ALL dogs love people food! They aren't stupid. LOL I have two dogs and they know they have to eat their dinner before getting that little piece of chicken or beef or a veggie. We DO NOT feed our pets from our plates, but we do save a little chicken or beef and then when the plates are ready to be washed I'll put the bits of meat into their bowls. Slowly introduce your puppy onto a different brand of food (FOR PUPPIES) which can be bought at any pet store. Get a small bag of dry food and some tins of food. Puppies need very little food (depending on the breed) so ask the person in the pet store how much you should feed the puppy after you tell them what type of breed the dog is. There is a great different from a Cockapoo (small breed) and a Lab pup. Of course the Lab pup is going to need a little more food. If this doesn't work then it's time to see your vet.