07-17-2011, 07:34 PM
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Well, the dark gums indicate poor circulation--I don't think she could pull back hard enough to cut off circulation to her head (it would have to be the carotid artery in her neck) but her owner COULD be compressing her left ventricle of her heart and restricting oxygenated blood flow to the rest of her body, which would explain why she passes out and the gum color. I would imagine her heart would have to be much larger than normal---what breed is she? Do you know if anyone in her pedigree has the X-factor gene?