[Definition] The prong collar is made of metal links that fit together by connecting through long, blunt, teeth that point inward toward the dog's neck. A section of this collar is made of a loop of chain links that tighten the collar when pulled, pinching the dog's neck. Its purpose is to mimic a corrective "bite" that another dog would give. The use of these collars is controversial and is opposed by animal rights groups such as PETA. This collar is mainly used in punishment-based dog training and does yield results. Some dog training organisations will not allow members to use them, and they are prohibited by law in some places.[90] [Tool] 
Prong collar or pinch collar
T r a i n i n g c o l l a r
P r o n g c o l l a r o r p i n c h c o l l a r
R a d i o - c o n t r o l l e d c o l l a r s
M a r t i n g a l e c o l l a r
H e a d c o l l a r
N o - p u l l h a r n e s s
D o g b i t e t u g