Review on 🐶 Set of 30 Puppy ID Collars with 4 Record Keeping Charts - Double Sided Soft Identification Bands - Adjustable Whelping Collars for Newborn Pets in 15 Colors by Seth Heck

Pros: Easy to use on puppies. They're small enough for newborns, and if puppies get too big for one collar, you can clip two together to make a larger collar. Cons: Collars begin to fall off almost immediately. Putting the right collars on the right weight control puppy was difficult. Several collars began to loosen in the middle and fall apart. The one in the photo has really completely separated and fallen apart. Now it's useless. I was hoping to use them for a few litters but they barely lasted 8 weeks.