I had two cats a male and a female they are about 7 months old and very well trained, then my brother went on a trip and got two more kittens two femaels 1 month old and now the male refuses to use the litter box even though he know how? what do I do about him I dont want to have to get ride of him.
The male cat is probably marking or spraying. Try buying another litter box. cats are very territorial. vetcare