possessiveness and rivalry

[Cookiepie]

We had some friends visiting with their new 15 months old new male dog yesterday. First verything was fine they played together in our backyard and then we had coffee inside. Pepik was of course excited but he is not territorial. But he did mount the new dog (Cooper) several times and we took him off every time. Are you supposed to leave that up to them?

Later our friend gave Pepik a rawhide while their dog was seemingly asleep.
Then after a while Cooper, the new dog stole it from Pepik and Pepik let him. And so Cooper became possessive and agressive about "his" rawhide and stole some of Pepik's toys that he(Cooper) also refused to let go of, even to his new owner and became agressive towards Pepik and anyone whom he believed would take "his" toy.

Do you have any advise what to do and not to do if we want to teach these dogs to live together, since they may or may not spend two months in the same home in summer?

Sofia

 

[Just-A-Clown]

For the mounting, you are doing the right thing. Stop him from doing it, usually just a sharp "hey" or a touch will be enough. Just let him know that this behavior is not acceptable. Mounting can simply be a playful act, not always dominating. But either case, just not polite or acceptable.

It sounds like Cooper has the issue here. Showing aggression towards his owner or other people is a red flag. This should not be acceptable. I would try a rigid routine of NILF with Cooper, bet it will help. Google "Nothing in life is free" lots of information out there.