That's a very interesting case you have there!
I don't think you should be overly concerned, although I do think there are a few measures you should take to ensure that YOU maintain control in the relationship. I can see how he could potentially control you with his toy infatuation, and we don't want that to occur, so I think you should be reinforcing your position as alpha because if you say that playtime is over, it's over, no more, done. And at that time, he should start playing by himself if he's still in the mood to play.
So I can give you some tips on maintaining control as alpha in a little bit.
In terms of whether this is an obsession or a symptom of OCD, I don't think that's the case, but I would say that he's going to be more prone than other dogs to developing such conditions in the future. This is the case because anxiety usually occurs for one of two reasons: poor mental health due to an excess of unexpended energy OR poor self-confidence with a lack of coping skills. So we just need to keep him in check and you can do that by playing with him when YOU want to play, but when you don't, he's on his own and he needs to understand that.
Play, in wild dogs, serves a few functions. It serves to build relationships with other dogs. It also serves as "practice" for hunting. And it serves as a way to expend energy. So I think in your case, it's a combination. Play for your boy is a relationship builder - he likes the interaction with you. It also sounds like he has a LOT of energy, and so he's expending some of that (energy is one of those things where it's going to come out whether you like it or not. It's better that it comes out in the form of a positive, acceptable behavior, because otherwise, it can come out in the form of aggression, destructiveness and anxious behaviors, like barking) In the scheme of things, play is a good way to expend energy, but I think if he gets some more exercise, he will tone it down a bit. A walk, for a high-energy dog, is not sufficient. Your dog sounds like the type who needs a run or a jog in order to drain his excess energy. If you're not a runner or jogger, there's other alternatives too. There is a giant spring mechanism that can be affixed to your bike. Or you can get a pair of rollerblades. Fetch is a good exercise too, but it's not as draining as a run is since the running is intermittent, so I still recommend at least one long daily run if you can swing it. Exercise will expend some of the energy that's manifesting itself as play. And it will help keep him in a healthy state of mind. Because a dog who has lots of pent up energy is prone to anxiety and destructive behaviors - I think more exercise is going to be your key.
In terms of anxiety triggering the seizure, I don't think this is going to be the case. Mental state can have an effect on epileptic dogs, but it's usually a very, very intense emotion. And to me, it sounds like your dog has excess energy and a very strong play drive, but I don't think he's at the point that would contribute to epilepsy. One thing that does come to mind is whether a hormonal imbalance could be triggering both the seizures and some of his extreme playfulness. Hormones can have a very dramatic effect in terms of behavior and I wonder what, if any, role it may have here. It's something to explore a bit further with your vet, as he can look at his hormone levels, lab work and other diagnostic tests.
Back to the alpha-ism.....we're also going to need to re-establish you as the alpha in this relationship. If we want him to respect you as the leader, we need you to act the part. So you need to speak firmly and confidently and when you issue a command, it should be distinctly a command, not a question or statement. KNOW that you are bigger, smarter, more stubborn and in charge! Your body language should exude confidence and control - stand tall, use a firm voice, make eye contact. And most importantly, maintain control at all times - he can't ever walk away from a situation thinking, "well, I just won that one!" You're in control. Act like it and you'll see it makes a big difference.
Here's a few good web pages that explain about alpha-ism, and they include information on how to reinforce your position as alpha. Please note on one of the links I provide, it talks about holding your dog's scruff, making eye contact and shaking your dog when he snaps at you - please DON'T do that. It is just as effective and a much safer method for you to use eye contact and a firm, confident voice. Never shake your dog, as it can injure him. Normally, I wouldn't even put up a link that had that sort of info, but it has otherwise valuable information that I think will be helpful to you. http://www.canismajor.com/dog/alpha1.html http://sonic.net/~cdlcruz/GPCC/library/alpha.htm
I hope this helps give you some direction with your playful boy! Just "reply" if you have any additional questions, okay?
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