I have two cats, one male and one female (siblings). They are both 1 and half years old. They have always used the same litter box since they were kittens. However about a 3 weeks ago my girlfriend went out of town for a few weeks on vacation and the female started doing the old #2 in the sink. She has done this even after my girlfriend returned and continues to do this now. Both cats are more attached to my girlfriend then they are to me. We always make sure to clean the litter box, two cats it's kind of hard not to.
So my question is if this is a health issue for her, or is this some kind of mental reaction from the female cat?
So my question is if this is a health issue for her, or is this some kind of mental reaction from the female cat?