After spending his childhood studying, observing and drawing animals, Guillaume became an art agent. Moving between their home in the Loir-et-Cher and Paris where they have a second home, Guillaume and his husband live with about thirty animals... all of them are very unusual.

Simon wanted to name his dog after an American state: South Dakota Dog was written on the animal's passport. But in reality, whether they are in the countryside or in Paris where they share their time equally, she is called Dakota.