he might be more sensitive to noise now that he's older, I have a 8-11 year old I don't know how old she is exactly but she's more afraid of loud noises now then she was when she was younger. My Toller mix is 1 and she gets terrified when she hears thunder or any loud noise, she jumps up on my lap and pants and shakes really badly sometimes she shakes so much it weakens her to the point where she can't walk.