We just learned about the type of dog the Curly Coated Retriever
Just like the curly coated retriever had curly hair, there is a dog called the Flat Coated Retriever that has flat non-curly hair.
This is another type of dog used a lot for hunting, with strong jaws and a long mouth for carrying birds and other animals that it is returning for hunters.
The flat coated retriever looks a lot like the labrador retriever, but there are a few small differences like the flat coated retriever has longer hair and a thicker chest.

(from: wikipedia - flat-coated retriever)
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