my husband and i adopted two cats about 7 months ago, they're about 1 1/2 years old now. the people at the adoption center told us that they had grown up together, but i'm not sure if that means they are truly brother and sister or not. we were told they are both fixed and they have both been in to see the vet for shots and checkups since we got them, but recently the male has been acting like he's not fixed. he's been peeing in our dirty laundry baskets and also our bed yesterday. i'm not sure if it's truly spraying or not, but this afternoon he tried to "mount" our female cat, his "sister." he's also been acting a little more aggressive/hyper and more vocal during the day. another thing (i'm not sure which cat is responsible,) is that both yesterday and today we've woken up to find a turd on the carpet. is it possible that these two things are related? i haven't been able to call the vet yet because the office was closed over the long weekend. anyone have any suggestions??