I have several outside/feral cats. They have access to the heated garage where they get fed and have fresh water. I also have 3 litter boxes out there. They have been peeing around the perimeter of the inside of the garage. They also use the litter boxes. I tried putting pine pellets litter in one of the boxes to cut down on the odor but they refused to use it. If I put pine pellets around the garage perimeter, would it deter the cats from peeing? I'm not sure which cats are doing the peeing. I'm pretty sure it is not all of them as there is definitely urine in the litter boxes.