Fetish Zone "Cadejo" K9 Sheath
[FZ33114 Cadejo Sheath]

Probably best canine sheath around! I had two of other brands and ... they were meh. This is organic, feels natural and adheres perfectly, transmitting all the sensation from its surface. It's like being a werewolf! My girlfriend loves it too and finds it intensely sexy (even though she was initially quite shy around it), though with my natural size and the sheath, forget about fitting the knot in there before she gives birth, ha ha ha.

Cannot recommend more! The fitting insert for it is also perfect (as I'm slightly shorter than the full length of XL). If you are of smaller size - measure your dick absolutely precisely and buy the most fitting one, remember it can stretch a little, and in doing so it's going to fully adhere and give you even better sensation and control.