Since I was a kid, I was exposed into different kinds of animals as pets. I was lucky to have parents who loves keeping pets and raising them. Most of the pets we had are dogs and cats. But there was one problem my mom would always complain about, most especially with the cats - they tend to urinate all over the house almost everyday.
When I grew up and had my own set of pets, I had the same problem in the first few weeks of keeping the cat in my house. I noticed at first during the time I only had one cat, it doesn't 'marked' my house as his territory, but when I got a new male and a female, it's when it started urinating all over my house. My only way to stop this was to give away the new male cat to my brother. It's a sad decision, but I had to choose who'll stay.
My mom said cats like to mark their territory like what lions and other big cats do in the jungle. They will urinate on parts of the house where they think possible rivals may enter.
I recently found the answer on how to stop your cat from doing it and how to instill in your pet's mind that your house is its territoty and no other can claim it except him. Watch this video from the BBC channel on YouTube, of which I am completely addicted to. I think I've watched hundreds of their wildlife videos.