My dog was neutered on wednesday. Afterwards he seemed fine and happy even, he peed a lot all around the house too, but now he hasn't peed for over a day. I'm really worried that he's in pain and his bladder might be in trouble. I'm going to give him less water until tomorrow when I can call the vet and see what is wrong. Has this happened to anyone else before? My dog is a 6 year old shih tzu, I hope this isn't because of his age. Please give me some advice! Thank you so much.