The question is, can a landlord refuse to permit a tenant to keep a guide dog, or other assistance dog, in a flat, the lease of which contains an absolute prohibition on keeping pets? The short answer is no for several reasons. The first is that guide dogs, and other assistance dogs, such as hearing dogs for the deaf, are working animals, not pets, and are relied on by their owners for independence and mobility. The training that these dogs receive and the monitoring of their health and wellbeing means that they are unlikely to be a problem to the landlord or other tenants. They are under the close supervision and control of their owner at all times.