Caesar is 10 months old now and he is potty trianed to go outside. Now that it is getting cold out there, he doesn't want to even go outside. I have to put him in the grass and he runs back to the cement. Then he holds it all day long. Is there a way that I can train him to go on a pee pee pad for the inside? Or is this a bad idea? I would also be more comfortable leaving him inside by himself while I'm not home, if he used a pee pee pad. Can someone give me some advise if it is good to do both (inside and outside)?