Now I don't think her throwing up is from too much sun. This weekend Stitch did not go to my parents, so she didn't spend a lot of time in the sun. However, yesterday I came home to a sick dog again. She would not eat her treat after our walk and she threw up sometime during the day when we were gone. These episodes only seem to happen on Mondays- could it be separation anxiety from being left alone after being with us all weekend? The rest of the week she is fine. My dog is crazy (but I wouldn't trade her for the world).