12 Week Old Viciously Biting PLEASE HELP
This is my baby boy Cooper. He's an angel most of the time. He's extremely smart and has mastered all of the basic commands. I take him to the dog park every day and lately his nipping has become violent and scary while we're there. He does great once we get there, and he plays with all of the other dogs. I stick close to him, and whenever I walk away he follows me though.
Eventually he starts to untie my shoes, and bite at my ankles. I can calm him down for a bit, but then when he continues later and I try to calm him down again by squatting down and offering him a treat to sit and be calm he begins to attack my hand and sometimes makes me bleed.
I feel like Cooper's problem is that he can't control himself well and doesn't have an off switch. It's like he gets extremely hyped up and can't calm down and just goes crazy. I usually try to wear him out by removing him from the fenced dog enclosure and putting his leash on him, then taking him over to an area with tall grassy bushes because his favorite thing to do is charge through it and roll around.
However, walking there and back he charges at me on the leash biting, growling, and barking. This is so strange because he extremely rarely shows any behavior like this at all, besides when he's off his leash at the dog park following me around after playing.
It is so different from his typical behavior that it almost feels like he becomes possessed for a short period of time. Has anyone ever experienced anything like this before? I've tried every method to stop it, and those methods work for regular nipping at home, but nothing will calm him down once he begins acting like this.