I am at my wits end with my dog. I am starting to wonder if he has a mental deficiency or if that is even possible. My neighbors look at me like I am crazy because I walk him on a leash in a fenced yard. He is a smaller dog (about 10-15 lbs built like a dachshund but not one). I have even resorted to putting him on a leash in the house to make him stay near me. In the house he will constantly mark if he gets out of my sight. When we are in the yard he just constantly tries to escape. While on leash he will play fetch and will listen ok, definitely not good but ok. The second I take him off he runs circling the fence trying to find a way to get out. He is also nearly impossible to catch he will stay just out of reach and keep running. I feel like he can not get his energy out while on a leash but just do not know what else to try.