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Daffy

Dagwood & Blondie

Dagwood

Daisy

The day's eye. A flower with a yellow centre and white petals.

Dale

Dweller in the valley. Geography - a valley, i.e. over hill and dale.

Dasher

Santa's eight reindeer - for the pet who dashes around

Dennis

Wine lover

Dilbert

Dinky

Of small size.

Dino

Abbreviation of Dinosaur.

Doc

Dogbert

Donald

Ruler of the world

Dopey

Dazed or lethargic

Duchess

Wife of a Duke