Mu has it. When we go on walks ALL she does is look for squirrels. If I ask for attention or for a leave it (when she actually sees one or is trying to chase) I get it for a little bit and then she gets her reward and goes back to squirrel watching. She gets hyper-attentive and to be honest it's freaking me out because it is the exact same way my sister's OCD dog gets about lights. She doesn't even react to dogs on our walks now - which is awesome but I don't want to trade obsession for obsession. How the heck do I fix this?