A domesticated carnivorous mammal (Canis familiaris) that typically has a long snout, an acute sense of smell, non-retractable claws, and a barking, howling, or whining voice.

The dog barked loudly at the mailman.

A male animal of the family Canidae, especially of a fox or a domesticated breed.

The dog fox was seen prowling near the henhouse.

A despicable man or youth.

He was considered a dog for betraying his friends.

A mechanical device for gripping, holding, or fastening something.

The carpenter used a dog to hold the wood in place while he sawed it.

An informal term for a hot dog, a type of sausage served in a sliced bun.

I ordered a dog with mustard and onions at the baseball game.

Informal. Something that is of poor quality or a commercial failure.

The expensive marketing campaign could not save the product—it was a dog at the box office.

Informal (chiefly US, usually in the plural). A person's feet.

"My dogs are killing me after that long hike."

dogverb

To follow or track closely and persistently.

The paparazzi dogged the celebrity everywhere she went.

To cause continual trouble or distress.

The project was dogged by technical difficulties from the start.

US slang, usually with "it". To act lazily or with little effort; to loaf or shirk.

"He was supposed to be running drills, but he kept dogging it on the sidelines."

dogadjective

Relating to or intended for dogs; canine.

They stock a wide range of dog treats and toys.