Australian Cattle Dog has been nicknamed a «Red Heeler» or «Blue Heeler» on the basis of its colouring and practice of moving reluctant
cattle by nipping at their heels.
The Australian cattle dog, for instance, was selectively bred to control the cattle's
movements by nipping at their heels, whereas, the border collie was bred to stare down sheep.
Smaller kids that can be «herded» might fall or get hurt when the Puli tries herding
them by nipping at their heels.
He has a strong herding instinct and may try to «herd you»
by nipping at your heels.