I normally have my vet do it though a groomer may be able to use a flea shampoo. The vet has stuff that works better though and it's well worth the extra $. The pup has to be 12 weeks I think though if it's life or death I think they will do it sooner. When I had my cat I had to have them flea dip him. When I first got him he was almost dead from the flea's.