I have a cordless Conair (Costco 24.99) with a ton of combs and accessories for people, but just doing feet, ears, and tummies/hinneys I keep running out of juice before I'm done.
I do have a tiny Wahl that runs on an 'AA' battery that I love, bc I can just pop a new battery in it, but I don't want to attempt any larger areas with that one. The dogs don't seem to be bothered by it either.
Wahl Pocket Pro Trimmer - Dog.com