i have 2 dogs. a female(spayed) lab/english springer spaniel mix and a male black lab. about 1yr ago my male started humping my female, about every 4 to 6 weeks, for no reason. we thought maybe she was putting out some odor or something. and the vet suggest urinary track infection... so we gave her cranberry pills and that seemed to help the situation for a while but about 4-6 weeks later it starts all over again... what can i do to stop this or how do i stop him from doing this?