I find with animals far enough away from me to need 'laser ranging', there is plenty of time to use the rangefinder. Mine fits in a shirt pocket, or in it's little holster on my belt beside my Leatherman "Wave" (VORTEX 1000).

I will and do range big game with my range finder - just to test my range estimations, but mostly only use the range finder when shooting gophers. I don't (have to) shoot big game at longer ranges than a "point-blank" demands.