At their worst, problems with neighbours can last for years and prove to be the bitterest fought legal battles out there.
Browsing: Neighbour Disputes
It is said that in the modern world we do not know our neighbours. This is often true of people living in blocks of flats.
In addition to covenants regarding pets there would generally be covenants regarding causing nuisance to other occupiers of the building.
I have lived in my private flat for 27 years where there is a policy in place forbidding any noise between 10pm and 9am.