Deerish

Then Jim spoke in a guarded tone. "I don't see a thing except a jay and some bushtits. Do you?" "No, I haven't seen a thing that looks deerish. I guess we drew a blank this trip. […] "

Twice a day the caribou was dressed in bells and led outside to pretend (with other deerish peers) that they had some vested interest in a fat man.

He also had a deerish look of bewildered innocence, as if, after all this time, he still couldn't comprehend his circumstances.