The correct answer is: My dog barks a lot but it isn’t barking at the moment.
The verb “bark” is used to describe the sound that a dog makes. The verb “is barking” is in the present continuous tense, which is used to describe an action that is happening at the moment. The verb “didn’t bark” is in the past tense, which is used to describe an action that happened in the past. The verb “barks” is in the simple present tense, which is used to describe an action that happens regularly or repeatedly. The verb “was barking” is in the past continuous tense, which is used to describe an action that was happening at a specific time in the past. The verb “won’t bark” is in the future negative, which is used to describe an action that will not happen.
In this case, the most appropriate verb to use is “isn’t barking” because the action of barking is not happening at the moment. The dog is not barking at the moment because it is sleeping.