It looks like you're providing different variations of a sentence related to dogs barking. Here are the corrections:
- "The dog barks loudly whenever someone approaches the house." (Singular subject with singular verb)
- "The dogs bark loudly whenever someone approaches the house." (Plural subject with plural verb)
- "The dog barks loudly whenever someone approaches the house." (Correctly using singular subject with singular verb)
- "The dogs bark loudly whenever someone approaches the house." (Correctly using plural subject with plural verb)
- "The dogs are barking loudly whenever someone approaches the house." (Correctly using present continuous tense for plural subject)
If the intent is to identify errors, the sentences without subject-verb agreement are the ones that need correcting.