Which of the following is NOT a type of corrective collar?

The Martingale collar is designed specifically to prevent dogs from slipping out during walks while being gentle on their necks. Unlike other corrective collars that can apply pressure and potentially cause discomfort, the Martingale collar tightens only slightly when the dog pulls, ensuring safety and control without harsh repercussions. It is often used for breeds with narrow heads, like Greyhounds, to provide a secure fit. This design focuses on training and guiding the dog rather than correcting behavior through discomfort.

In contrast, choke collars, slip collars, and shock collars are all designed to apply direct physical correction. Choke collars tighten around a dog's neck, which can cause discomfort if used improperly. Slip collars adjust around the neck but can also tighten if the dog pulls, leading to potential distress. Shock collars deliver an electric stimulus as a form of correction, which is often controversial due to concerns about dog welfare.