We own two large dogs, a WeimerReiner/Lab mix (7yrs) and a Black Lab (2yrs). Both dogs are house trained and will not urinate in the house. We have been 'dog sitting' for my mother's Cockapoo and HE is a different story! He doesn't pee at his house, only MINE! We've had to rip out the carpet downstairs it got so bad. Just little spots here and there, like he's marking his territory. Now that the carpet is gone (we're walking on concrete floors now) I can SEE all the little spots where he's peeing. WHY oh WHY is he doing this? It's driving me nuts! Any way to make him stop?

Oh, the cockapoo is a neutered male and our two dogs are male (one neutered).