The big ones can carry spotted fever, they get to be about the size of grapes when filled up. It's the little ones that carry Lyme, they only get to be about the size of a big corn kernel or so.
We had horses, "ticking" the horses was a regular activity in the summer. I'm immune to gross out factor anymore. They used to love to get into their tails at the very end, into their polls (the top of their head between their ears) and along their manes. We'd usually keep them off of their body everywhere else because of bug spray, but it's impossible to put enough spray on them to keep the ticks out of their manes and tails.
Frigging ticks. I can remember waking up in the middle of the night after a day at the barn feeling one crawling on my head or somewhere -- DESPITE having showered. Bastardly things.
HR, you have a little dog, why don't you get a nice pyrethrin dip and do him yourself? That's how we used to take care of our fuzzies when we had both cats and dogs. Honestly, I never did trust that Frontline shit, I just couldn't see how it could keep anything from getting in between their toes and stuff.