I dunno; i think i;d be tempted to keep it on the smallish side.... big enough for a person should be more than enough room for a border collie; i think enough room for both might be pushing it a little bit, size-wise?
I was thinking about taking one of these smaller sized sections of a shopping cart and making a side car for my Yorkie, however she's so scared of any loud noises she'd be on my lap in seconds riding anywhere with her. I thought because this kind of shopping cart gets deeper towards the rear, it would allow her to lay down and yet still see over the front.
There plans a-plenty for bmx side-hacks on the interwebs. RRB Member @rev106 hosts (hosted?) a BMX sidehack race. Pics here: https://www.flickr.com/photos/17534977@N00/albums/72157646613057351
Might be easiest for your dog if you just had one permanent sidecar-equipped bike for the pooch, and these things are sturdier if they're welded on rather than bolted on, and it might be fun to mess with one of those for human passengers, too....
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