two male cats that use to live indoors and I have moved them outdoors because they will not stop spraying and they are both neutered. I bought them a shed and a dog kennel attached, they can go back and forth via a cat door. One is 8 years old the other is 2 years old. It has been cold here this winter and my oldest one seems to want to stay outside rather than go in the shed which I have blankets, cat cubes etc. I guess I am wondering if they know to go inside for warmth rather than stay outside in the cold. I am worried that they will get sick especially my older one. Will they be OK.