All fair points, but to be honest, the only problems I've had in about 2 years have been guinnea pig related: they started to fight each other and blood was getting shed, so they had to be seperated.
They all eat the same food (which is a rabbit mix from my local garden center, which seems to be exactly the same as the guinnea pig mix only without the sunflower seeds which are apparently bad for them), and sometimes I'll mix this with some Guinnea pig pellet mix.
As far as living together goes, each pair get along famously-the rabbits and guinneas' are very affectionate towards each other-they groom each other and always sleep/rest together, normally with the guinnea draping himself over the rabbit like a blanket!
I haven't had any problems with pasteurella yet (and hopefully I won't), but it's coming up for 2 years now (well, almost-we only got biscuit yesterday to keep Smudge company) and they seem very happy with their current living partners! Plus, whenever they go to the vet for check-ups or innoculations, the vet always comments on how healthy and happy they are.
Don't get me wrong, I'm not knocking the advice presented in the link that you posted, but I wouldn't house rabbits and guinneas' together if it was affecting their health. I understand the issue of rabbits being larger etc, but again, the only injuries sustained have been through Sparkle & Smudge fighting with each other (including Buster getting a bite on the bum once when they kicked off next to him and he didn't get out of the way!).
Thanks for your concern, it's appreciated!
