Questions from someone new

[DLsheppard]

What size is best to start out as a beginner, want to do anal and work up to fitting a knot

 

[Bloit]

Something that fits you comfortably enough not to hurt, but large enough to (slightly) stretch...
Depends on the person.

 

[Flµff]

Are you familiar with anal 101 ? This kind of stuff : Relaxing. Increasing the size and the hardness progessively. Lubing. Leaving your ass some days a brake if there is pain or irritation.
And above all, having fun.
I am not sure dogs make such a big difference... when it comes to train your ass.