Eager and quick to learn, they are best trained in short intervals, as they may bore with repetition. The Flat-Coated Retriever is a slow maturing dog, as they do not reach full maturity until 3–5 years of age. Even then, these dogs retain their youthful, puppy-like outlook and demeanor well into old age. Paddy Petch, author of The Complete Flat-Coated Retriever, refers to these dogs as the 'Peter Pan' of the retriever breeds, given they never quite grow up.
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