Hi my name is linda and my yorkie is shady he is a 12 pounder! we have a huge itching and biting are pulling his hair out to where he is almost bald on the top part of his body. he just itches all the time. I have tried every thing to try and stop this. changing his diet useing all dog meds over the counter too even useing benderal , hydrocortisone. nothing is helping vet isn't helping much either. does anyone out their have this problem,and what can I do to help him. Im open to any advise. I know he is miserble

thanks shady and his mom