Our 3 1/2 black lab has in the last year a hard time going to the bathroom about 3 times. he will stand there for 3-5 minutes and nothing or little dribbles will come out. He also has had about 4-5 accidents in the house in the last 2-3 weeks. In the past it just lasted a day or two and then it goes away. But tonight he peed twice in the house within a 10 minute span, and that was with him also being let out to pee twice. What is the deal? I really can not afford a huge vet bill right now, so hopefully you can help me.