Bests & Worsts Reviews from Amazon

This collar is very sturdy and well-built! I bought a MEDIUM (the blue collar in the pics) as a training collar for my German Shepherd puppy. So others can see the sizing, I included 2 pictures with a 2L soda bottle (because I am a visual person when I’m trying to feel confident about sizing!) The 1st picture displays the SMALLEST you can size this collar - it fits around the 2L soda bottle. The 2nd picture displays the BIGGEST you can size this collar - you clearly have almost double the room. Hope that visual helps others with their sizing!