Review on Hamilton Double Deluxe Collar 20 Inch Dogs best for Training & Behavior Aids by Barb Parker

This is an excellent collar. Very durable, long lasting, great bright colors. This is my second purchase of this brand of collar for my dog, his first is still in great condition, he just outgrew it. BUT the size is significantly different. My German Shepherd is 22.5 inches where a well fitting collar would normally sit and 23.5 inches. down his neck near his shoulders where a loose collar might fall off. I bought 24 and 26 to see which fits best. on the LAST hole (the loosest hole). I'm keeping the 26" collar so it has more room to grow. I hope this helps others determine the correct size and not having to order multiple pieces and return them like I did!