Petey goes through the same thing sometimes. He "pinks up" like you say, and it doesn't really matter if he's inside or out when it happens. I think it could also be from playing rough sometimes? and some spots getting a little irritated from the rough play. on his last vet visit, we asked and she said that it was nothing to really worry about, since we'll really be able to tell if he's getting sunburned or getting some kind of funky skin. we have to be pretty careful with Petey though in the sun because it gets like stupid hot here in texas--Rich