In French, the word for dog is chien, which is masculine. This means that when you refer to a dog in French, you would use masculine articles and adjectives. For example, you would say le chien (the dog) and un chien (a dog).
However, it’s important to note that if you are specifically referring to a female dog, you would use the term chienne, which is feminine. This distinction is common in the French language and is found with many nouns that have gender differences.