The U.S. Postal Service will honor military service dogs in an upcoming 2019 stamp collection honoring the "brave and loyal" service animals.

The agency announced in a press release that the service would offer sales of booklets featuring 20 stamps divided between four breeds of U.S. service dogs: German shepherds, Labrador retrievers, Belgian Malinois and Dutch shepherds.

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Each stamp features a breed of dog on a red or blue background with a white star. The pages of the booklet each contain four stamps, one of each breed.

Art for the stamps was created by DKNG Studios and designed for the stamps by the Postal Service's art director Greg Breeding, according to the release.

CNN reported Wednesday that about 2,300 service dogs are currently stationed on U.S. military bases around the world.

More details are expected to be released about when the booklets will go on sale, the USPS said in its release.

The agency will also release stamps including designs honoring the transcontinental railroad, tennis champion Maureen Connolly Brinker and artist Ellsworth Kelly.