We live in an apartment in an old building which is split into several others. Five in total.
In the lease it says we are not meant to have pets with four legs. We all have the same rules...recently a couple moved into the ground floor flat. They are letting the flat through an agency.
Last weekend we saw them walking a dog in the park and Dh says he has heard it also in their flat. We never see them going in and out with it though, wonder if they usually take it our after dark or when no-one else around!