What is a synonym for dog?

There are many synonyms for "dog," depending on the context and desired level of formality. Here are some options:

Formal:

* Canine

* Hound (can be specific to certain types of dogs)

* Fido (a generic term for a dog)

Informal:

* Pup

* Puppy

* Doggie

* Pooch

* Spot (can be a name, but also a general term)

Slang:

* Mut

* Cur

* Mongrel (can be considered offensive)

Literary:

* Beast

* Creature

* Companion (emphasizes the dog's relationship with humans)

The best synonym for you will depend on the specific situation.