Hey there! Are you talking about beg/sit pretty? I actually haven’t taught this to my ANCD, though I imagine it would be possible given lots of time. It’s much easier for some dogs, depending on their body type. My Malinois Onyx is really good at this trick, she loves it. You have to start out only asking for a second or two, and very slowly build up the duration. It takes a lot of core strength for them, so they have to build up to it. I used a food lure to start out with, and always made sure to reward in position (while they still had their front legs off the ground).
I hope that helps!