Labrador Retrievers are the most popular purebred breed in the United States, so it’s no surprise there are a lot of Lab mixes out there. However, there are also a lot of dogs misidentified as Lab mixes who have no Lab ancestry whatsoever. Often, this is due to a dog being solid black, brown, or yellow. Though these colors are in Labs, they’re found in many other breeds as well.
If your dog is Lab-like but doesn’t have Lab ancestry, they inherited their coloring from other breeds in their family tree.
To learn more about some of the ways Lab ancestry can present in mixed breed dogs, check out this page: https://embarkvet.com/resources/breeds/labrador-retrievers/by-the-numbers/