RIO7, any idea why a snake would go into the dog pen? Water? Shade? I literally have zero experience with rattle snakes other than a bowhunt in Arizona for desert mulies. We were coming off a "hill" and I walked right up on one in the early evening. It coiled up and started rattling and my partners .45acp took care of it. Of course I teased him that it took 6 shots to finally hit it! LOL! I did send him some .45acp snake shot ammo after that and was grateful he was as close to me as he was.