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She was in the backyard so I know she wasn't hit, she was a greatdane and I know they can have heart problems if she had a heart attack,stroke or embolism that would cause her to bleed out?
When a dog suffers from bloat, the stomach swells and/or rotates cutting off blood supply to other vital organs. This is the number 1 killer of Danes and one of the most serious dog illnesses. A dog suffering from bloat may die in a matter of hours if left untreated."