[sweetbee]

So I just adopted a new puppy from a private home. She weighed in at 2 pounds when I brought her home at 2 months. I have another yorkie who is flea and tick free and who I use advantix on because he ventures outside. I don't take my new baby out for walks since it was advised against for at the vet. My new baby had little fleas and her doctor thought she was too young for meds and didn't prescribe anything but did prescribe a med for the worm she passed. He also said he believed the worms and fleas came from her litter. Well the fleas grew huge and many in number by her 4th month. I saw another doctor at his practice and he prescribed capstar and I asked for revolution as the flea preventative. Well the fleas are back but these are new because they aren't as huge as the other ones were and less in number. We only have wood floors with a big rug and wash her bed and vaccum frequently so not sure why she still has fleas! I went back to the vet and given capstar again for her new weight at 5.5 and advised to have her take bravecto since it works for a longer time but reading the advice on her I see that revolution is more popular. I am worried about bravecto and wonder if I made the right choice and why do these fleas keep coming back? I thought capstar was very effective?