Dr. Anukarna Singh
Along with medications it's also very important for you to understand the source and avoid that. Ticks would usually come from other dogs/ greenery. If your pet is allowed to meet with dogs who have ticks no matter what we do the ticks will keep coming back. At 4 months I would suggest going with topical spot on rather than oral meds. Also check your house to see if there are any ticks there to avoid reinfestation, you can use ridd to clean the house if you see any.