Lazy french bulldog refuses to walk downstairs

At 4 months of age Charlie the french bulldog suddenly refused to walk down the stairs. Having had hyperactive Charlie from 10 weeks old his owners struggled to keep him calm from running riot up and down the house..until one day Charlie refused to walk down the stairs. Baffled by this sudden change Charlies owners decided to video this. Having tried to coax Charlie down with all kinds of treats/dinner Charlie would not budge happily ignoring his owners request.