Can a dog's skin open on its own?
My 10 year old JRT has an almond shape and size break in her skin right where her haunch meets her side, at the very top, slightly under it, as though someone was about to cut her haunch the way you would remove a chicken thigh. It wasn't there last night, although I did let her out briefly after dark to pee. There is no sign of a bite, nothing jagged, it's clean (and I keep it clean now). I suppose it could have been cut on the ancient wire fence she climbs through day in and day out for years, but that has no sharp places. I suppose she could have been cut many ways, but I'm wondering if skin ever breaks open by itself.