Hi there First of all Welcome to Yorkie Talk...
As for you little man.. Please keep a close eye on him.. My Babybear is one that has AAI/AAS he broke his neck when he was a year and ten months... He still can not walk,I work with him daily.. He did this over a year and a half ago... Yorkies or any pup for that matter with neck problems she be treated like little china dolls.. Please Babybear has a lot of info on his dogster page..
http://www.dogster.com/dogs/136060 Read his diary (archives) you can see his story.. We lost him at first he died at my feet... My husband gave him mouth to mouth to save his life.. He went undetected with his AAI.. So please read his webpage and contact us if need be.. He now has a email addy also..
Babybearswheels@aol.com if you would like more information or like to talk... Or you can Private message me...
But please do not let him jump or do anything crazy.. Even after he gets his cast off.. I don't want to see anyone go through what I have or do every day..
Don't want to scare you but this is very serious...