I just got a new puppy this evening and my kids called me at work to tell me that it had fleas, the dog was not in the house for more than an hour I told them to get it in it kennel and put it in the garage. I don't want to harm the puppy but my kids are devested that the dog can't come in. The puppy is 8 weeks old and all the products at wal-mart said not to use if they were under 12 weeks accept for 1 but it was the same brand as the rest. It is Hartz ultra guard spray. What can I do? And do you think they are now in my home, I have 2 kittens also.