I got this collar for my small breed dog. When it came I did not expect it to be as big as it is. It does fit my small breed dog but it a bit long for him when he has it on. I tried it on my large size dog also and it fits her to. I love how it's rubber and waterproof so it won't be ruined getting wet when they are wearing it and it is reflective cause of the silver strip in the middle around it. This is definitely a collar I will be using on my multiple size dogs.