The think what Tucker does that most impresses me (and others) is his leash knowledge. I have a long retractable leash I walk him with so he can run around a bit (in a 29Ft radius around me). Therefore, he's always going around trees and whatnot but he ALWAYS comes back the way he came if he feels resistance on the leash. In other words, if we're walking parallel to each other and a tree comes between us, he'll scoot closer to me as we pass the tree and then scoot back to his original line….BEFORE we even get to the tree. He obviously KNOWS the tree is to be avoided or else he'll get tangled. He even bolts into the woods along the sidewalk sometimes after a squirrel or whatnot and weaves in and out of the undergrowth and between the trees. When he's done doin' what he's doin' in the woods, he always follows the leash line back to me, again, never getting tangled. People walking with me and observe this and their like ''does he do that on his own??'' A lot of times the lead has to hit the tree before he changes direction, but there's no pulling or anything. He just senses the direction change and runs along the leash until the obstruction is cleared. If I'm walking through an area dense with trees, he tries to explore further out, but keeps running around the trees (in the right direction) never getting tangled or twisted. I think in the two years I've had him, he's been tangled twice and I know one of those times was my fault because, even without formal training, I assumed he could navigate a series of bollards that I weaved the lead in and out of.
Every other dog I've seen just wraps their dumb-ass around the tree and gets stuck and needs to be untangled.