Personally I would not use this collar on my cats, they are out hunting a lot and I would be afraid they might get hung up on something and be able to get loose. I only use collars for them with 3/8" break away buckles.
I know that it will fit my miniature schunzer, but it won't fit my cocker spaniel. The best way to be sure would be to measure your dogs neck. This collar measures 14" at the longest.