I wanted to get one of them for my dogs but did'nt think it would work out very well because of their size differences...one is 43 lbs the other is 6.5 lbs. If they were closer in size I would definately try it out.
I might have to get one of those for the grrrrls. I do love to take them out together and watch everyone's facial expressions - the grrrls seem to get a kick out of it too, probably because they are black holes for attention, lol!