These puppy ID collars are especially for breeders.
There are many breeds where you can hardly distinguish the puppies, especially straight after the birth.
Equal colours, birth weight equal, perhaps even the same gender? This sometimes makes it difficult to separate, and yet it is particularly important, be it e.g. daily weighing, control of the navels or the deworming the pups. As a breeder we know the problem very well!
Made of extra-thin, slightly shiny, 2 mm Paracord, a robust nylon material, 100% PES, with 2 sliding knots on the ends, they “grow” with the pups on average from birth to about the 4th week, depending on how fast your puppies grow. Normally at this point each breeder can keep his puppies apart without collars.
The size S has a diameter of approx. 3-6 cm, the size M can be adjusted by approx. 4-8 cm. In any case, you should control the collars at least once a day and always make them few mm larger.
Please also note that the head size must still fit through the collar, if you want to remove it. Alternatively, you can cut it carefully with rounded scissors, but then the collar will be useless.