[Drdogface]

Good questions, but it does not have the right color to be tissue...at least looks that way to me... More like some foreign material, cotton, paper, chewing gum ? The gum line around/under it will be sore for a bit and I'll bet the breath will be funky if it's been there long.

I once removed a pork chop bone from the roof of the mouth of a large dog. It had wedged sideways up on the roof of the mouth between the left and right sides. Stench on that dog would gag a maggot...