Animal humor

So my friend Ruth is fostering this dog named Ben. He has been through quite an ordeal with his previous owner (like 4 surgeries after eating a towel). When Ruth received the dog she got all his medical records. One thing that popped out was the previous owner had taken the dog to the vet because his penis seemed to be stuck in the excited state. The vet told her it was "a stress induced hard-on". Really??? Men, does this happen to you as well? We women want to know!