We tested and tried this leash - and it helps so many dog stop leash pulling.
This leash is best for:
Doodles, some pittbulls, boxers, large dogs who could pull their owners over, Great Danes, St. Bernards, and surprisingly, some labs, dogs who don't do well in a prong collar)
This leash is not great for:
Some pitties- it's really hit and miss. German shepherds (they just prefer other tools), brachiocephalic breeds (their snoot can hold the leash properly) and intact male dogs (they tend to hate something over their nose)