Functionally, they are completely different, as explained in a previous comment. Visually, they are also very different, with the equine penis being more similar to the human in appearance, taking into account all the obvious differences. In dogs, in addition to the "os penis" and the knot, you find varied shapes and colors when erect, and their arousal is more dynamic, passing through several phases from when the lipstick go out of the sheath until it is fully inflated. In a large specimen, you will almost certainly find a penis larger than the average human penis. The sensation of licking it and when it penetrates you is pleasurable, due to the higher temperature, the texture between rough and smooth, and above all, where I notice the greatest difference... the immense and constant amount of precum and sperm they spit out, easier to swallow and tastier than human sperm. In short, in terms of size and knot, in addition to the amount of lubricant, they have better penises than men, and the stamina and arousal they achieve can allow you to enjoy them several times a day. Anyway great lovers