I'd treat the yard for fleas if I were you. Right before we started having our flea problem here, we saw a huge possum in our yard with 4 babies on her back, she was burrowing under our deck. The exterminator told me that it's very likely that this is where the fleas came from. The only other place my babies go is to the groomer every two weeks, and they are meticulous there. They check every animal that comes in for fleas and whatnot, and segregate and treat any that are infested. They are not allowed anywhere near any others on that visit. I know how careful they are, because I work there in exchange for my babies' grooming.
If you want to read what we've been dealing with here, you can see it here:
http://www.yorkietalk.com/forums/yor...ah-flease.html
Them opossums are ugly-cute
