Our 5 month old puppy vomited up his entire breakfast this morning. I called the vet, who advised that it probably wasn't too serious, just keep an eye on him and don't feed him for 24 hours. But he's vomited a couple times since then (just stomach juices or water, I guess). He doesn't seem to be suffering (as far as I can tell), although he might be a little less energetic than usual. Should we be concerned? Do any of you have advice on what to do in this situation? This is the first time he's vomited, so we're not really sure what to do!