[Help] SPCA told me not to walk my dog?

I brought my puppy who is roughly 5-6 months old to the SPCA today and he got his DHPP shots and they said not to walk him because he could potentially catch parvo but I been walking him for a while now and he hasn't had any problems..?He is a yorkie/Maltese mix. via /r/dogs http://ift.tt/2rO3eMv