Rambo is so strong! I had my Grandma and Grandpa over, and I was going to get Rambo out on his leash, so I got his leash out of his house, and I was about to hook him up until. . . Rambo ran out of his pen, with me still hanging onto his harness! He stopped running after about 2 seconds, and I was sprawled on the ground. I wasn't hurt or anything and it was quite funny after I lay there for about a minute! I finally got Rambo attached to his leash, and we fed him some fat free popcorn! A special treat! Rambo liked it a lot!