What's your best source for collars?
PetSmart & Petco have a ton of choices for collars, as long as you have a small breed or want adjustable collars.
Lily has an adjustable one, but it tends to slip gradually more loose when we go for walks. She's a regular swimmer in the backyard pool and I don't always catch her to take off the collar before she goes in. I tried a leather collar from the store, but it stretched tremendously after one quick swim.
Basic question - where do you get your collars? I'm assuming many of your dogs swim or get wet on a regular basis ... they're labs after all.