I’d agree, as a rule of thumb, and I wouldn’t send him n a beaver, unless it was stone dead, and dead a while.....and never on an otter. That’d be insanity....mini water badger. However, he’d jump a beaver you never saw and kill it, dug out and killed huge ground hogs, ran into packs of coyotes and slung coyotes 6’ in the air, would kill a big boar raccoon before you could blink.....he had a ‘thing’ for that, unlike any lab I’ve ever had. Glad he never got mixed up with the bobcats around here, though. He left out one night after a pack of coyotes, and I had two dead ones in the yard the next morning......but temperament of a service dog around people or other dogs. He even ran loose at my Uncle’s Veterinary clinic.....could mediate all the cats and dogs in the waiting room....or let them all out at night, too. LOL