I've seen someone in Brighton walking around with two yappy-type dogs in a double-decker-doggy-buggy.
I have to say, I am not a fan in the same way that I am not a fan of women who walk around with small dogs, half the size of one of my cats, tucked under their arm or in their handbag. (where do these little dogs poo?!)
However, there always seems to be a voice of reason and so I can now understand the cat show angle to see the usefulness of one of these. . . . . . fair enough, I suppose it would make life a lot easier . . . . . . . but walking around the shops with one?? Hmmm . . . . can't quite fathom that!
Each to their own, I suppose - and that is what makes life so interesting!