I think that more apartment buildings should not allow pets such as dogs or cats. I have two reasons.
First,the pet are noisy. Some people do not feel well.If there are the pets next rooms ,people can not sleep well at night.
Second,It is hard to clean rooms.They sometime move much in the rooms.Owners have to clean their rooms every time.
Therefore,I think that more apartment buildings should not allow pets like dogs or cats.