I've got 11 year old male Rottweiler. He's got somewhat difficult character but so far I've managed to deal with it. Circumstances made me temporarily give shelter to another male dog. Since his very first day of living with us, my Rotty began to pee all over the house. He has literally peed everywhere. I have to clean every half an hour! It doesn't just makes me nervous, I'm really shocked! The only reason I can think of is that he tries to show the other dog who's the boss here. Can it be because of something else? What should I do? Punish him or just live this period through?
Because your dog is already 11 years old and the second dog is male, your dog is marking his territory and showing his dominance. I'm afraid that it's not going to stop until the other dog is gone, and may not even stop then because it will become ingrained behaviour in very short order. Punishing him won't change this, and could even cause other behavioural problems. In his mind he's only doing what is natural.

Is there any way that you can separate the dogs until the other one goes home? Maybe you could keep your dog in the house and the other in the garage, or if no garage, opposite ends of the house. Then only allow them to be together while outside, where peeing and marking are expected.

Tell us a bit more about your living arrangements, and I'll see what else I can think of to help you until your visitor goes home.
I've never had dogs so perhaps I'm going to tell utter rubbish butttt... doesn't it have something to do with pack leadership? As in, when a human is a good pack leader, his dog will surely know what is allowed and what is not. I admit I must have watched too much of Cesar Millan's dog show lately, but he always deals so well even with elderly dogs. Emotion: smile
Ruslana, it does indeed have something to do with pack leadership, but in this case the dog is exerting his dominance over a new dog introduced to his territory. In this instance the best way to handle the situation is to separate the dogs while in the house until they get used to each other.

Think of it this way ... as the dominant and only female in your household, how would you respond to a new female being dumped into your territory without your prior knowledge or approval? Just one day she's suddenly there, taking over your entire home, whether you like it or not, and whether you like her or not. You would be hurt and resentful, and begin to show your dominant role in the home.

What I would have done, bringing a new dog into a home where an 11-year old dog has lived for such a long time is this:

Keep them separated and introduce them outside, where they are free to sniff each other and pee all they want. As they become accustomed to each other, then begin to bring them inside the house at the same time. It's outside the home, during the introduction period that you can assert your dominance as the pack leader. It's extremely difficult to do that if you've already dumped the new dog onto the unsuspecting existing dog's territory.

Even better would be the way that I introduced Bentley and Koco. Koco went with us when we looked at Bentley, and they were introduced in Bentley's territory, so there was no fear or sense of rejection for Koco. Because I was able to eliminate those fears from Koco's mind, he accepted Bentley almost immediately. If I had brought Bentley home, without that introduction period, I'm pretty certain that I would be experiencing the same problems of him peeing everywhere.
Oh I get it now. That makes sense! Thanks for the clarification. Emotion: smile
You're most welcome. Emotion: smile
Thanks for your suggestions. The other dog will be gone in about two weeks, for now I've separated them. I hope this will solve the problem.
I hope so, too. Good luck, and let us know how your dog responds. I hope he stops peeing in the house.