Even though we have leash laws in California, I've been chased by a pit bull and a cocker spaniel in my own neighborhood. I outran the pit bull. He only lasted a block, and I had a better angle on him, but I did run a stop sign to keep moving. The cocker held on for a couple of blocks. I was more afraid of the pit bull, but that cocker certainly was tenacoous. A pit bull cocker combined breed would be real trouble!