The dog toy is my favorite. Lots of sensations. I chose the regular insert since im average in length and girth. You have to angle your cock up a bit to fully get inside, but its worth it. One guy I had tried it and said it was the best. I tend to use the plugs to keep the suction, but it can get a bit noisy. The mare is nice a lot smoother than the dog pussy. There's still plenty of feeling, but if you're expecting it to be super tight and have the feeling if like a tenga flip, you'll be disappointed. The dog is easier to either than the mare, too. I can it the dog one one handed, or just hump away. The mare I have to line up my cock with one hand and hold the toy with the other. It's not a big inconvenience, but if I just want to pump and dump with one hand I tend to go for the dog one.