Judy? You've never had to use HW med? Wow. That's So Cal for you! Central Cal is odd. Bakersfield rarely sees cases, Fresno some, Sacramento has a problem, and way North CA you can guess how many shelter dogs are HW positive.
We like Heartgard because it also is a monthly general wormer. Never know what you pick up out there in the world.
Cubby is already on flea/tick too. Because we go to the mountains, I choose Advantix II because it repels as well as kills. Nothing more disturbing than camping and looking over to see a mosquito just sucking away on the tip of the dog's nose. At times that can be here but we haven't had the rain to do it.