Potential second dog peed on my current dog

 Sounds to me like hes marking his territory. As for the rough play, some dogs play rough. Good luck!

 Sounds like that to me too. I just never saw or heard of another dog peeing on another dog before.

 I've had a male dog pee on me!

 Yuck!  Hopefully it's not a huge dominance thing.

 No, even my female will mark.

When I take my four out to potty I have noticed that my pomeranian will try to pee on the others (all larger than him), usually while they are peeing.  I call him away when I can catch him doing it.  I don't think he really means to pee ON them, but rather is trying to mark over their pee.  He just isn't waiting until they finish...and has bad aim.

 This dog definitely peed ON my dog!  He stood in the kitchen, went up to her, lifted his leg, and peed.

It's not something that would be a deal breaker for me.  How did the two dogs get along otherwise?   How did your female react to him peeing on her?  The reason could be he was marking and she happened to be standing there or he could have done it deliberately.  Dogs tend to work out these things between themselves if the humans don't get too emotional about it.  Not saying you got emotional but people tend to see more into some dog behavior than is merited.

 My current female is a bit dominant and plays quite roughly.  We think she's a border collie mix, so she attacks from all angles, nipping constantly.  He didn't back down from her, but never initiated anything or hurt her either.  After a half hour of rough-housing, they each laid down and were fine.  They did this off and on for the 2 hours he was here. She didn't do anything when he peed on her, just stood there like "what the heck"?  My husband yelled (surprised), and he stopped.   

 We are going to bring the dog to our house for a trial run next Fri-Mon and see how things go.  If all goes well, we are going to adopt him.

 Update- I just contacted a very good trainer that we worked with in the past.  She said that the behavior is typical of a male dog and simply means he likes her!

reneegavin

 Update- I just contacted a very good trainer that we worked with in the past.  She said that the behavior is typical of a male dog and simply means he likes her!

It means he wants to keep her;-)  Also, ask  your hubby not to yell when stuff like that happens.  It makes it harder to train the dog not to mark, as he may try to hide when he does it to avoid being threatened.  This dog may or may not be house trained, and yelling is bad for house training, too.  But, it's very common for dogs to urinate in new territory, especially if they want to claim it.  People often notice that dogs forget their house training skills, even if they were well trained, if they are newly rescued or the family moves or visits a strange home.

 No, we normally don't yell for housetraining accidents, but my husband turned around and saw him peeing on our dog, and it caught him off guard.  It was just his first instinct..  I thought it was ok to say "No" and lead them outside as long as you caught them right in the act of having an accident?