I got the smallest size for my long haired Chihuahua puppy. He was 4 months old when I got it and he is current 7 months old. I wouldn't recommend the smallest size for a puppy or dog that's getting use to a collar because it's not very durable. I've had this collar for less then a year and it's already falling apart. My puppy did scratch at it alot while he was getting use to it and it would probably fall apart faster for a bigger dog. I would recommend getting something cheaper then this for a dog that's getting use to a collar. If you have an older dog or dog that's already use to a collar it should be fine then. I did like the design but now you can't even make out the design. I was also disappointed with the clasp. It's a metal clasp which is different from all the other sizes which have plastic ones. I thought it was a plus at first but it doesn't click when you take it off or on so its hard to tell if it's in or out all the way. I had so much trouble with this at first because trying to fumble around with a collar on a puppy that's already protesting it was NOT fun. The ring to attach the tag and leash is also pretty small. It made potty training in the first few month harder then it already was because you have a tiny clip that you're trying to find as fast as possible on squirming puppy to get him outside to pee. That's what finally led me to get him a new collar from petco today. it was definitely much more expensive but the material is much better quality. Overall I do not recommend the smallest size however, idk if the other sizes are made out of better materials.
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