I have heard also about the hereditary factor concerning bloat. Strangely though, the mother dog of Josephine(whose name was Joker, a friend of mine's dog) never had bloat. Back in '96 when Joker had a litter of pups, Napoleon and Josephine were the 2 that i picked out and named. Joker was more of a salt-and-pepper sheperd-type dog and looked somewhat different from the black lab features of her offspring. Unfortunately, Joker developed her own health problems- a cancerous tumor near her hind leg that eventually had to be amputated. Soon after, around 2003 she had to be put down. I can't help but conclude there was most likely some bad-gene connection between Josephine and her mother, Joker. But both dogs had incredible playful energy and a unique personality. You would never suspect that health problems were on the horizon for either dog. But now they are re-united and running free together, anxiously awaiting Napoleone to re-join them.
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