I went away on vacation for a month and my father and grandmother took care of my cat while I was gone. He is 10 months old and before I left he never peed or pooped on the floor not even as a kitten. Now all of a sudden when I come home he is not using the cat litter box at all he just pees and poops in random places around the house. How do I train him not to do this or what do I do to keep it from happening?