My female Dobe zena, for some reason, wakes me up to go throw up every Friday pmorning (occasionally Saturday instead). Otherwise she seems completely healthy, spunky, and still has tons of energy to play with our male. I've never heard of anything like this before. Any ideas? She's fed Diamond large breed, four cups a day (two in the morning, two at night). Doesn't really have any interest in eating objects around the house, or getting into things she's not supposed to have. I just can't think of what would be making her puke every weekend like clockwork.