"I bought 2 of these collers for my 2 new baby ferrets, they are about 8 weeks old. I like the sturdyness of them but they dont fit on my ferrets, i put them as small as they will go and my ferrest still slip right through them. Im hopeing they grow into them as they get older, the matching harness as well. The only thing i would like to see with this product is that they make a smaller size one and they get a little more color varriety.
Overall a good product though, but dont expect to use it right away if you get babys."