Hi all! I know it's premature but I've found a collar that my winter puppy just has to have. They are sized in inches. Does anyone have any idea of a size that might work for 8 weeks to maybe 4-5 months? I'll take this further: if any of you has a puppy who's about 12 weeks old, would you mind loosely measuring her or her neck? Someday I won't believe I wrote/asked this!