I buy the small (1/2" thick or so) quick release adjustables, and recycle them thru pups as well. The small ones last thru ~20 wks or so for me, at which point I go to a medium thick version. Sonya (6 mos) is almost to the end of that one though, so time to take her shopping... -AnneMary Jane said:I got an adjustable collar that has been through three dogs. Mya will be able to wear it till about 9 months old. Don't know if I can wait that long to get her a cool new one though! I also take the collar off unless we travel, but not until they are really well trained. We live close to a busy road.