my stud dog is 7 years old. hasn't been bred this year and is in a concrete 8 x 12 pen. nothing has changed in his diet but he has started pissing blood and piss all day now. has anyone had this problem or know what is going on. i took him to the vet yesterday and he ran a cbc on him and checked him for worms and his prostate and didnt find anything. i have to take him back tomorrow since he is still bleeding. his last 3 litters has been 10 plus litters. i have made plans to get straws off him in 2 weeks now. any help is appreciated.