Review on Uiuix Puppy Whelping Collars: 5 Record Keeping Charts, 15 Colorful ID Collars, Adjustable Bands for Breeders by Abby Page

Unfortunately they didn't last long. Within a day or two, many of the pups fell (who were only a day old, so didn't move much), and even those holding on couldn't tell what color they were - an important ingredient for puppies. Collar. Within a day or so all the pale colors started to look the same so I had to paint on them while waiting for another set to arrive. The cards are fancy but not very practical; I prefer to keep my information in a spreadsheet. I haven't used them, but I can imagine that without the right pen, the information would quickly become smeared. Overall not the best value for money.