Review on Whaline Puppy ID Collars: 15 Colors for Newborn Dogs 🐶 & Cats - Soft Fabric, Adjustable & Effective Pet Identification Bands by Danielle Martinez

We breed dogs and they are great when puppies are just born but the cloth material obviously gets dirty quite quickly. So I would advise you to avoid soft colors like white and similar green/aqua tones. (over time they will start to look brown or gray and it will be difficult to tell puppies of a similar color apart) However if you want to take your time we also wash them in the sink to keep the color nice and light and clean (of course you have to the puppies will be collarless for this, so I recommend buying two packs). They're quite long, which means you'll have to wrap them around your neck about twice before you reach the velcro. Within three weeks we gave up on most and bought collars with clasps. We have found that when the Velcro starts to bend and get hair or dirt on it the edge stops sticking, especially if the puppies continue to play so some of it has come loose. But it was at the age of 3-4.5 weeks. So, in general, they do their job during the first few primitive weeks of puppies.