I rent out my flat which is on the third floor a mansion block. It has a back door that leads to a sort of small bridge, a couple of feet wide and about 12 foot long, with the neighbours back door at the other side. It's a fire escape but it only leads to our neighbours flat.
They have just got a dog and let it poo on this bridge causing a bit of a stink.
They are a little bit strange and perhaps aggressive - I'd like to offer a solution rather than just threaten to call the council (they are council tenants, I think, but mine is leasehold). So what can be done about dogs in flats? Apart from looking after them properly and taking them out for walks of course .