I have a neutered 7 year old cat that has recently taken a liking to peeing in my sister’s bedroom. ONLY on her things. We did recently get a small dog that he doesn’t particularly get along with, but he only started peeing in my sister’s room about a month ago and we’ve had the dog for at least six months.
This sounds like Urinary Tract Infection. Your cat is in in pain from having crystals blocking its urine flow- it tries to find comfortable places to help itself. its most common in males.
Please read everything below, it might not seem relevant at first, but its important for your cats health.
You are most likely feeding dry food, right? Dry food has a lot of grains and very little actual meat.
In the wild, cats eat meat- no grains. Cats are carnivores, remember? That means they get energy from meat and fat.
Yes, fat is good for cats, it does not make them obese, it is a primary energy source.
Cats don’t have the same nutritional needs as humans, and people forget that when feeding their cats (and dogs). A bag of pet food with images of ‘hearty whole grains’ looks appealing to us, but is no good for our pets.
Grains (corn, wheat, rice, oats, barley) are what make cats obese, and are included in nearly every commercial pet food (why? its cheap!). Grains have carbs; in a cats body, carbs turn into sugar and then fat. Carbs aren’t used for energy. Thats why so many cats are obese or have diabetes.
Pet foods also use by-products, which are meat bits ‘unsuitable for human consumption’- aka heads, feed, organs, intestines, etc
Never buy food with these ingredients, dry or canned. I tell you this for your cat’s benefit. 
Look for high protein and high fat content so he can become a lean mean fighting machine.
Ok, onwards.
Cats eat raw, fresh meat (contains about 65-75% water) in the wild, so they are well-hydrated. It isn’t necessary for them to drink because the water is in the meat. That is why most cats just don’t drink water from their bowls, even if they’re dehydrated- they’re meant to get water with their food.
How does this relate to Urinary Tract Infections?
Basically, cats on dry food get no water (even if they do drink, they only get half of what they need)- so their urine concentrates and forms crystals that block the urinary tract and cause pain, and cats try to pee in comfortable places (like beds).
However, cats on canned food get just as much water as they would naturally. This dilutes the urine and stops crystals from forming. Each can is about 75-78% water- see how it simulates raw meat?
So, I suggest feeding your cat mostly high quality canned food.
You can choose to feed him canned only or go with the following example of using canned and a bit of dry.
Each regular-sized can feeds a 6-8 pound cat completely for a day. So for example, if I have a 10 pound cat, I’d feed it half a can in the morning and half at night. To make sure it gets enough food, I’d put some quality dry, using the feeding guidelines on the bag- enough to feed a 2-4 pound adult cat. So a can and maybe 1/8th of a cup of kibble a day total.
Always look for quality food.
Rules:
- No grains or by-product in the ingredients.
- Over 40% protein and over 16% fat
- Under 18% carbohydrates
While canned foods look like they have less protein and fat and as such, don’t follow my rules, that is because everything is diluted by water. To calculate the real protein/fat, here’s the formula and an example.
Canned cat food:
moisture: 78% and protein: 10%.
Remove moisture from the ‘total’ (100%) and you get the percent of dry matter, which is 22%. Turn this into a decimal (0.22). Divide the protein content (10%) by this decimal (0.22). You end up with a whopping 45% protein! You can do the same for fat, carbs, ash, fibre, etc.
Good dry foods are: Orijen, Innova EVO, Wellness CORE, Horizon Legacy, Artemis Maximal, Nature’s Variety Instinct
Good canned: Innova EVO, Wellness, Nature’s Logic, Natural Balance, Evanger
You won’t find them in any old store- find their websites through an easy internet search and use their Store Locators.
These foods are more expensive, but are more nutritionally dense. Cats eat until their daily requirements are filled.
So your cat can eat less of the kibble, for example, because it fills up its nutritional needs faster. So the bag lasts longer, and your cat is healthier because theres no extra junk.
It will most likely also keep you from having to pay vet bills for diabetes, kidney problems and obesity in the future. 
Also, if you tell your vet about this problem and they perscribe a food to you, please don’t feed it. Its grains and a chicken head in a bag labelled as ‘a compelte and balanced diet’. The AAFCO that controls labelling and standards won’t stop me from putting that on a bag of ground-up leather boots. Vets also don’t need to take nutrition courses , and are sponsored by big brands to sell their products.
visit www.catinfo.org for more info.
www.pets.ca has a forum called the Bulletin Board, and his filled with knowledgeable people who will share their knowledge with you abot nutrition, and will enjoy talking about anything else.
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