Brittany duck dog?

I have a brittany who loves retrieving ducks, but she doesn't have an ounce of fat on her body and gets way too cold. Is there any way around that? Anything y'all would reccomend?

Frequent high fat diet

get a vest or a S.U.G.A.R Coat.

Good fitting vest.

Vest will help but they're not really built for cold water duties. Just be careful and use common sense.