i give all mine a tractor supply cheap flea and tick dose,come in tube and put on nap the neck for cats,dogs middle of shoulders and tail,i have too,here in texas lyme diese pretty common along with heart worms,so mine get both once a month,i have about 40 deer here on the place covered in ticks,not one time have i seen a tick on my dogs or cat,you can watch them assholes crawling all over the deer,look like ants,as long as they have a warm host they stay on them,lol,i was feeding one my buck yesterday,watching one crawl down his snot while he was eating his daily cup of corn hahaha