My dog has been vomiting in the morning about once or twice a week intermittently for a few weeks. She is 5, a mutt (my best guess is border collie and husky mix?) and otherwise seems fine. Before and after she vomits she doesn't seem to be bothered at all and is active and playful. I haven't brought her into the vet yet since it doesn't seem to be effecting her very much, but since it is happening on and off for a while now I'm starting to get concerned. Any recommendations?