Apple is not the Cocker Spaniel, Hannish. She is a white Bichon Frise.
Her friend Winston is the Cocker Spaniel. Winston looks fairly typical. Very cute.
Lupo, I think, is a Cocker Spaniel crossed with a Labrador. (Spanador)
There are types of dogs quite related to the Cocker Spaniel.
I can think of the King Charles Spaniel, for example.
Lupo was called a purebred cocker spaniel, supposedly Kate's parents breed them.
There are two types of cocker spaniels. There is the English, and the American. Winston is likely an American, as they are known for their shorter noses and more pronounced brow, both of which the dog in the photo seems to have. The English tend to have a longer snout.