considering you failed to groom him in a full year. considering he has never, ever been groomed. Id bet he just feels very different now. a whole years worth of dirty , Im going to assume also matted coat, ear hair ect all taken away will make a dog feel strange. Were his ears matted? Did they have to shave the ears as well? if so id watch for hematomas. due to blood flowing back to the ears, being cut off by no circulation due to matting. He probably is itchy due to being shaved now as well.