I just brought a new kitten into our home and he won't use the litterbox! His first night in the house he peed and pooped in the bathtub twice and tried to poop in the towel basket, fortunately I moved him to the floor just in time. He has his own litterbox but shows no interest in using it. We have been slowly introducing him to our other cat for the past 3 weeks but this was the first day he spent 24 hours inside. He has been checked out by the vet and all is well. Any suggestions???