I've switched pretty much exclusively to 4Ds as a K9 handler. The wider sole base really does a great job preventing ankle rolling; like a squat shoe. I haven't worn the 3Ds since 2013ish? They were an ok patrolman's boot except that the sole wore thru quick and when I jumped to K9 the body got thrashed. But I picked up the 2018 version after reading that the body materials were changed to those of the 4D and the sole was redone. They do feel like the little brother now. I'm saving them for warmer weather but am excited to see how they hold up.