Check around your house and see if you find any other females either engorged like the one your dog had or a little black round one. The males (look like spiders) and are also black or reddish if small. The female engorged gives birth and that's when you have to her ALL of them or the infestation continues. I've used Frontline on my dogs ticks and it has gotten rid of them. You must use it for at least 3 months. The tick cycle is every 15 days. Have your lawn sprayed to kill all of them.
