I presume it’s because getting up to your shins in mud makes it hard to draw your leg back out, whereas on stilts all your muscles and joints are above the stilt platform, allowing you to use them freely to draw the stilts out of troublesome terrain. That’s just a guess though.

Presumably, the sheep don’t need to get a quick move on, while dogs simply do not obey the laws of physics.

Kickstand for your stilts!

Don’t you dare criticize their traditions. Now relax your sphincter…