3 week older puppy?

My dog just have a litter of 4, 3 weeks ago. One of the males, the biggest pup, has a spot on his tail that looks dry and lost some fur. I know he requests to see a vet but can anyone tell me what might grounds this to happen? He is plump and nourishing like the rest of them but,he is the just one that has that spot on his tail though. If you know the inflict please answer, thank you.
Answers: It could be a whole bunch of different things. It could be allergies, ringworm, mange, or of late a patch of hair loss. You could of late keep an eye on it and if it get worse take him surrounded by. At 3 weeks their is not a whole lot that can be done even so. Good luck!
it could be allergies to fleas

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