We see this alot in cats , inappropriate urination can be seen in cats for a couple reasons. One is Urinary tract infection. They will urinate where there owners will notice them doing it, as a sign to show that something is wrong. In the shower, in the sink, on owners Dirty clothes...etc Or Two ...its behavioral , meaning that they do it because there has been a change in their environment that they do not agree with. Felines hate changes in their environment. We had a case where the cat would piss in the bathroom sink...Urinalysis turned nothing up. We asked if any changes in household...nothing at the time..again, came back with same issue..asked again..they said ..come to think of it..we rearranged the living room, moved a end table she would use to sit on to look outside....they moved it back...problem solved.