(A) dog’s barks
Explanation: to find out if you have to use singular or plural you have to look at the verb which is ( bark) at a dog’s is one dog so it has to take a singular verb which is the dog’s barks and for be it is plural so it takes a plural verb so it should be the dogs’ (bark) :) .
Note : singular verbs in with “s”
Plural verbs do not end with “s” .
Hope it helped you ❤️
