I highly recommend a dermatologist. It saved us a lot of time and money with our last dog. Also go raw if you can. It helped my dog immensely and a friend of mine recently went raw and her dog grew back his hair and stopped itching.
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This would be a good idea, I'm sure.
bruce, the vaccine didn't cause the parvo.
A puppy, by the time it's 4mos. of age, should have had 3-4 vaccines, because each successive vaccine builds immunity.
If your puppy wasn't vaccinated until 4mos. of age, it was behind 4 vaccines
This left it's immune system wide open for any infection, and when you give the 1st vaccine, there's a period where the immunity wanes (although at 4mos. it's likely mom's immunity was gone, too) and so because of that, the puppy contracted parvo. This is why series are given, but starting much much younger than 4mos., mom's antibodies override the 1st vaccine when given at 6-8 weeks of age.
How Do Vaccines Work?: a Veterinary Guide to Understanding Vaccinations.
It is important to understand how vaccines work - they don't keep the pet from getting the disease, but when the pet does get the disease, vaccines have trained the body to respond and destroy the disease before it causes harm.
Unless your dog has a basic immune system problem, the vaccine could not have caused the puppy to get actual parvo almost 2 weeks later.
Either way, a dermatologist is your best bet, and perhaps they can explain some of that to you and figure out what's going on with your puppy's fur and skin.