Originally Posted by spellweaver

It might be a urine infection, or it could be a cyst or tumour on his prostate gland (especially if he is an older dog). Either way, I think you should take him to a vet to get him checked out - got my fingers crossed for you and him that it's nothing nasty Let us know what happens.

Originally Posted by ajshep1984

Only things other than a hiden injury I can think of are an infection in his urethra or prostate disease. I would definatly get him to the vets as soon as possible.