This is Chilie, a female golden retriever from Denmark who loves to dive for stones.
This dogs is very lithe and wiry– probably a mixture of performance and conformation lines.
But she’s definitely a credit to her St. John’s water dog ancestors, who were famous for diving down after shot seals.
Stones aren’t the best thing for a dog to retrieve. They are very hard on the dog’s teeth.
However, if one could find something else that will sink but easier on the dog’s teeth, this activity would be much safer.