My name is Mo!

We are unsure of what dynamic changed between our animals, but our sweet Mo will no longer tolerate our dog or his littermate or our other female cat we had long before. He is a great, but is now picking fights, causing a stressful environment and so our cats are not going in their litter boxes all the time anymore. Mo was litter trained and so we now believe this is an anxiety or stress issue, and with a calmer environment without other animals, he will return to using the litter box. He has been tested for urinary tract infection. We have tried different litters and attractants, but it is now clear to us that it is a social issue that we cannot solve in our household with multiple animals. Does like to go outside sometimes but it mostly an indoor cat. He is a great mouser. She is not overly friendly with kids, but does not mind them. An ideal situation for him is a calm, loving home without other animals and owner that is willing to be patient in his transition.