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I Love My Dog!!!
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My dog also use to puke when the vet would give her cephalexin. I would defiantly call your vet and tell them he vomited it up and he may need a different type of antibiotic since he pukes for them. My dog got spayed and her stitches also became infected and had to be put on 2 different antibiotics this was a few weeks ago and she healed up fine within a week.