Try not to use norfloxacin in puppies, which may affect the bones and joints of puppies. Gentamicin, injection and capsule are all acceptable, and Smecta drugstore has them.
If there are worms in your stomach, you will have a little diarrhea. Sometimes you can see long white bugs that can repel insects. My puppy will be driven away if it has worms in its stomach for a month, but it will not affect its appetite, and it can run and jump. You can take your puppy to the pet hospital and use insect repellent according to the doctor's advice.
It is also possible that the puppy's stomach can't adapt to the high fat and high protein content of milk, so drinking milk will cause diarrhea! The puppy is too small, only one month old. If it has teeth, it can feed soft dog food. When a puppy is weaned, it should be gradual like a baby. Don't eat because it hasn't adapted to eating soft food, so don't worry. You can feed some rice soup with an egg yolk in it, which must be crushed. Gradually add some soft dog food! If the puppy doesn't like to eat, he can feed some broth, but the broth must be skimmed, and there can be no oil at all!