[La_T_Dog]

I don't really have a direct answer to your question, but I got Pixie at 3 months and she had round worms at the time. My vet gave her a dewormer at the office visit and another dose to follow up with 2 weeks later. He said after that, her heartworm prevention would also prevent worms. He said that my other dog would not need to be infected by her because his heartworm preventative would prevent them.