What we do - when I feel that the "play" is crossing the line into "obsession", I just take the toy away for awhile and redirect Coby to something else.  I think that Sammy is probably fine and just having a good time.  But if you start to wonder about him getting a little too focused on the toy, just try trading it for something different.  I've seen the panting and crazed look in the eye.  That's when I try to distract him to something else.     
Good Luck!!        |