Woofus has been throwing up a lot lately. I started 2 weeks ago, he was not keeping anything down. On the 3rd morning he went to the vet. They took stool samples, Xrays (to make sure he didn't swallow anything metal) and they found nothing. He got some anti-nausea medicine and he's done ok for about 1 1/2 weeks. Now he's throwing up again. Any ideas? I home cook for him, and nothing's changed in his diet. It's been different batches so I'm sure nothings bad (I've been very vigilant about this). Hope someone can help poor little Woofus's tummy. Thanks.