Does anyone have experience with puppy ID collars? One of my girls may be expecting another litter (to sson to tell yet) and I am considering using these. Previously, I have used little spots of coloured nail varnish to identify my pups but this is not particularly effective as it tends to wear off too quickly. I wondered how good the collars you can get are i.e. does Mum try to pull them off, do siblings try to do so when they get older and start playing, do they seem comfortable for the puppies, do they stay on O.K.

