We got our puppy neutered about a month ago. That same week and peed in the house 3 out of 5 days and it was big puddles and really stinky. He quit for like 3 weeks and now the last 2 nights he peed in the house and it stinks again. He never went to the bathroom in the house before this and it seems like it is mainly in the evening. Could this be a side effect?