Female cat peeing on couch

Question
We have a female cat non-spade, she is now about 2 years old.  Recently she urinated on the couch, not sure how many times as it is a leather couch and took us some time to figure out she did it. seemed she peed on each cushion. When we first found this out we figured it was because we just got a new dog. The cat and our new dog took a few days to get along. Now they play like little kids. Then one day while my father was visiting (not sure if this matters, my dad was only there 30 minutes and the cat has met my dad prior) my Fiancee caught the cat once again peeing on the couch. The litter box was just changed hours before. This was months after the first incident. So we figured it wasn't the dog, she loves my dad.
We now keep the cat in the basement as we are in a new house and can not trust her.
We don't know if spaying her will fix this problem.

Answer
Mike,

Spaying her will definitely help. Peeing is a part of being in heat, especially if the couch is by a window and she can see any male cats outside.

Another of the most common reasons for peeing is a urinary tract infection or urinary crystals. It is painful when they pee and they will associate that pain with the litterbox and go elsewhere.

You may want to get her checked for that when you spay her.

Tabbi