In the US Uber drivers have to take guide dogs and folding wheelchairs, as does every public accommodation. However, taxi companies in the US have to have some number of vehicles that allow you to ride in your wheelchair inside the vehicle (eg a wheelchair van); hopefully that requirement will also be applied to Uber. As the father of a kid in a wheelchair and a heavy user of cabs, uber, etc, for years there was one taxi company in San Francisco that served us well with a wheelchair van, the rest would make you wait forever and not show up. Now that we have a fold-up chair uber black has actually been terrific for us: the cars are big, the drivers always get out of the car and help with the chair without being asked, etc. My son also has a large service dog and we have never had any problem from uber drivers about the dog just hopping right in with us.