Cool cotton will keep the sun off your pooch's head and protect the eyes and nose. If this proves too much of a problem.....turn it backwards and give them total street cred!

As a guideline -

XS suits chihuahua,

S suits small maltese, pomeranians,

S/M suits malt/shih tzu, cavaliers, mini schnauzer,

M suits schnauzer, cocker spaniel, cavoodles,

L suits staffie, boxer, small labradors

XL suits golden retriever, labradors,