Anthropologist Dr. Brockton unearths a primitive troglodyte -- an Ice Age "missing link": half-caveman, half-ape -- in a local cave. Through medical experimentation, she manages to communicate with him and domesticate him before he's let loose by an irate land developer and goes on a rampage, terrorizing the local citizenry.
The dog is attacked and strangled on screen. You can hear it yelp. It's reported in the next scene that the dog was killed, so I think this one counts. It was sad and brutal.