Hello! My dog is a mix between Chihuahua, beagle, Shih-tzu and a Bichon. He is usually a calm and collected dog who just is happy to see everyone and cant wait to say hello. but recently at night time, about 12am he starts going crazy at the window in my bedroom. He seems like he is trying to claw through! He makes an Extremely high pitched growl (if you could call it that.) It sounds similar to a whine or cry. there is nothing that i can see but he has done it for a couple of nights now. He wags his tails whilst he does it, and if you hold him back then he tries as much as he can to get back to the window. I know its quite odd, he only does it in the middle of the night. i would appreciate any advice / knowledge about this if it happens to anybody else dogs or if anyone knows about whats going on with him. Many thanks it is much appreciated.