Inevitably, in the life of every pet owner, there are unexpected behavioral problems here and there that need dealing with. It pays to be understanding and patient with your cat, as many times the issue is fully fixable and just a matter of understanding pet behavior. Here are some of the most common problems owners report having with their cats, and suggestions on how to handle them.

Soiling outside the litter box.
This is something that many cats will do when the litter box is not kept clean. Like us, they want to relieve themselves in a clean environment. If you have a multiple cat household like I do, buy more than one litter box, use scoopable cat litter and strain it frequently to keep it clean as possible. I have one robotic cat box that automatically cleans a few minutes after one of the cats leaves it. It does a great job but it must be kept clean or it will malfunction. The bottom line is, keep the litter box clean.

Wherever the cat has soiled outside the box, make sure the area is cleaned thoroughly with appropriate cleaner. You can buy cat repellant sprays at the pet store, those work pretty well. If you don't have any, spray the fully cleaned area with potent perfume, cats usually hate perfume and will avoid the area totally to avoid the smell.

You bring home a new cat, and the new cat doesn't like it.
Cats are territorial, and it takes some adjustment for everyone when a new pet is added in. Cats naturally react with hissing, maybe growling and swatting one another when really mad. I introduced a new cat into my household a year ago and he instantly got along with one of my cats but hates the other one. But, they have learned to tolerate eachother, and I bet when I'm not looking they may actually be buddies deep down. How I acclimated them to eachother is, at first I used a cat pheramone spray called Feliway in the room, which is a natural calming medium for some cats. It calmed my more hyper cat down somewhat. Also, a spray bottle filled with water works great if they swat at or get nasty with eachother.