In big cities such as London, dog friendly flats are becoming rare, difficult to find and getting very expensive when available. https://www.letswithpets.org.uk/ specializes in such requests.
...Mayfair-based agents EJ Harris say 10 years ago hardly any of their of their London tenants had dogs but today the figure is around 30%... Source
As landlords want to make sure that potential tenants and their dog(s) are well behaved a "pet CV" can be required (precise description of the pet with key facts regarding behaviour, health and grooming).
There is also the high deposit which can reach £25,000. These are for flats located near Hyde Park and Regent's Park.
So, why suddenly people want to get a dog? It is a bit of a trend linked to celebrities. George Clooney's wife for instance has been seen walking little pooches and automatically, people are after the same kind of things.
Whatever is on television and published in magazines, it will attract the attention. Fans/supporters like to associate themselves with VIP. It gives them a boost and a feeling of confidence maybe?!
Having a dog is fashionable again, which can be rather shocking as an animal shouldn't be considered as an accessory or object. Sadly, the 21st century is all about the look and image.
Here again... it is time to take time to explore and discover what was given to us: nature!
...It will take place over a 7 year, 21,000 mile journey by foot – of which two and a half years are already completed – and retrace the path of the first humans’ migration out of Ethiopia and around the globe, ending at the tip of South America. The organisation has recently completed a Kickstarter funding goal in order to finance the rest of the journey... Source