My 2 1/2 year old golden has recently been sporadic on her eating. I have always fed her 2x/ day and never had an issue. However, over the past onto, she had not eaten all her breakfast, and sometimes not eaten at all. She eats dinner well, but has had some episodes where she vomits about 4 hours after eating (almost bed time in our world). We live in Texas, and I attributed some of this to the heat. Her personality hasn't changed, but I have noticed she tires quicker ( I also blame the heat cause I'm the same way at 100 degrees)... When should I be worried about the appetite and the vomiting??