I did not know that birds carry parvo. That is a first to me. I had a dog that died of parvo and I was told by the vet to bleach the house and everything the dog touched because I had another dog. Now I have Daisy along with my mini pin and they are both healthy. I did what the vet said. I never did the yard though but luckily my other dog was up to date on his shots and heard it's harder for them to get parvo if they are adults and have there shots.