my puppy has little green pus filled sores on his belly?

the sores could be many things. the best bet is to take him to the vet. he could have worms or an allergic reaction to the flea medicine. hope everything works outt .

Poor puppy. Oh my goodness, I really question where you got this puppy from. Sores! Fleas! You need to be responsible and take some action. Go to you Vet ASAP. I would be really concerned. If he's not eating much he likely isn't feeling well. If your one of your human family members had the same problem wouldn't you take him/her to the Doctor right away? I shake my head.

The sores are a clear sign that the pup needs to see a vet, soon! Besides, he needs his vaccinations so you'll be taking him anyway within the next day or two.

A vet would know

You should always take a new pet to the vet within 48 hours of bring it into your home or sooner if you see anything wrong.

I don’t know where you live but whenever my puppy has any problems we call Dove Lewis. It’s in Portland OR but they are happy to help you over the phone. I suggest searching “Doe Lewis animal hospital” on google. You should find their website and their phone number. You might need to put a 1 in front of it for long-distance.

Get him to the vet asap