I've never heard of terror aggression describing prey drive. I am quite skeptical. I don't think that's correct for either breed. Most likely it's the result of a very poorly bred dog with a very poor temperament that doesn't match either breed standard.I have a friend with a goldendoodle which has killed two sheep which got into their yard (they're next to a farm). He's also nearly killed a cat. It's all terror-aggression according to her; he's afraid of everything. I have never in all my days heard of a poodle tearing out the throat of livestock, so I'm guessing it's the retriever in him..?!