What age can you put on a collar for your Yorkie?

Yorkie puppies can wear collars as early as 8-12 weeks old, when they have reached a weight comfortable for the collar. It's important to consider the puppy's size, and find a lightweight, adjustable collar that won't be too heavy for them. When first introducing the collar, keep an eye on your puppy to ensure it's comfortable and isn't scratching their neck.