I half expected ALL black pups and we did have 11, it's very hard to identify them and I had a pack of vet's paper colars but they came off, so I marked them in different places with Tippex, but Islay washed some of thier marks off so I was back to square 1...I think not being able to identify them led me to not noticing it was the same pup moaning and not feeding too well, although she did put on weight until the day before she died...anyway, I thought cat colars have elastic and are small so should be OK...they have been just the j ob and will expand quite a bit, even though Labs have fat necks!!!!! I have a sweet video and not sure how to post it other than putting the cold...anyone know?