Found this under the apple tree. It can move fairly fast. About 1 & 1/2 inch long and 1/2 plus wide and looks so furry it reminds us very much of a mouse. Back has a rusty colred ridge and it has a furry upturned tail.
He actually has a triangle shape when viewed head on.
Tho the Crinkled flannel moth also called the Black-waved Flannel Moth looks much like your photo, I believe your caterpillar is the Southern flannel moth because of the rusty ridge and the fact that this species has the “tail” you described while the black-waved flannel does not. They are both in the same Genus and as you mentioned can cause a painful sting.