Having just become mummy to two lovely little girls, I am looking for any information and help in transporting them on our bikes. We are looking at tank bags so we can still load bikes for rallies. All help appreciated. They are staffy shihtzu cross and will be a small ish dog, I hope lol

You'll be after the bagster friendly 30 litre bag at £129 at sportsbikeshop then… i haven't seen many tank bags as pet carriers though…
http://www.sportsbikeshop.co.uk/motorcycle_parts/content_prod/211092?r=GS&gclid=CO6v7JrsocoCFaoIwwodLxEL6g

On customcruising.com the pet transporter bags there are mainly attached to a sissy bar - so may rule out your GSX if you dont have one fitted.

As for bigger dogs? I would recommend a chat with eric debenham at mono-trail.co.uk, as the single wheel trailers he makes to tow behind a motorcycle handle up to 200 litres, so could handle a golden retriever or even a fairly large husky/malamut imho…

Thank you oddbod for your suggestions will look into it further... Not sure about the trailer though