Bad Dragon's Rex is pretty comparable to the real thing in terms of proportions. Medium is around average size for the real thing, and large is around great dane size. Never been knotted myself but the best training I've done is holding the large one in for as long as I can, and eventually I got to the point where I can keep it in indefinitely. (Which feels super good btw, it presses against your prostate and you can feel yourself throbbing)
Rex® is a canine anthro dildo designed for p-spot stimulation with an incredible length, a lightly textured shaft, and a knot that allows it to sit and stay deep inside you.
bad-dragon.com
