The standard by law requires you to have written permission to keep the pet. Any decision must be made by the majority which means more than 50% In agreement. HOWEVER, permission must not be unreasonably withheld.
The bottom line is, if the matter went to the CTTT they would probably be in your favour if the dog was not causing a disturbance and against you if it was.
Beware though – many a “we’ll trained, non barking dog” barks all day when their owners are at work or elsewhere leaving the dog home alone and bored.