For HW I currently use sentinel, but have used Ivenheart as well. Avdotya was a HW positive rescue and I've seen what it does with them so I won't mess around. For fleas/ticks etc. I usually only treat in the summer, and then once. When I was in Oregon I didn't have to treat at all. Since moving to Indiana however, I've had to treat every other month. I used to use frontline plus, but that didn't even put a dent in the fleas and I didn't want to have to use it every month. We switched to comfortis and have been flea free for three months (with only one dose). I'm also absurdly allergic to frontline, as in I can't touch my dogs for three days after putting it on without getting hives, so the pill is an excellent solution. The only thing I don't like about the comfortis is that it doesn't do anything for ticks, and thick Cardi fur isn't fun to dig through.