I have found 5 ticks on my year and half year old Moose in less than a week! This is the first time I've ever found a tick on him, but since the first one I've started looking more and now I've found 5!!

I use Revolution topical for him since he is so small, 4lbs. The chewable forms are too big for him.
I am worried about the disease potential of these ticks! I am also worried about doing a "flea and tick" dip as I've heard that these are just chemical bug bombs and think that might be dangerous for such a small dog. Any natural remedies for getting rid of ticks?
My other question..where is he getting them? Moose has luxating patella so we haven't been taking him outside as much (only 2 or 3 times a week) so his knee can rest before we decide on surgery or no surgery. So how could he be getting this many ticks from so little time outside?! Are they multiplying inside my house? Yuck! Please help if you've had experience!!
Thannk you!