By the sharp spines on the collar your pet will have to obey and the optimum training will be easier. A small tug on the leash and the spikes show the animal, who is in charge.
The application of the collar succeed fairly quickly by squeezing two spikes to a member of the necklace.
Elements Ø = 3mm, fits neck size up to 40cm
Elements Ø = 4mm, fits neck size up to 60cm