ive heard of rescues and cat owners with lots of cats using the large dog advantage on their cats to save on costs. One of my good friends back in MS did this with her 10 indoor cats. ( they went out onleashes on weekends and fleas are horrendous in MS year round)
frontline-- i cant say ive heard about it being used like that though.
Dont know much ofanything about using revolution-- i wouldnt bc its supposed to treat soo many things (worms, heartworms, fleas, ticks etc)