I can't quite remember the name but its been mentioned on quite a few tv shows in the past month in the UK but ill have to look on Google when I get home or you can, as my phones slow when I'm out
EDIT; just looked
Rabbits may bully guinea pigs, which can make them stressed if they cannot get away. The bacteria, Bordetella bronchiseptica,is the most common cause of respiratory disease in guinea pigs. Rabbits, cats and dogs can carry this bacteria which can pass to guinea pigs and cause disease. Therefore, guinea pigs shouldn't be housed with rabbits
Copied from the RSPCA website, also
They have different needs (e.g. dietary). Unlike rabbits, guinea pigs cannot synthesise vitamin C which must be provided adequately within their diet. And they can intentionally or unintentionally injure guinea pigs by kicking them or trying to mate with them (can injure the poor guinea pigs back.)
EDIT; just looked
Rabbits may bully guinea pigs, which can make them stressed if they cannot get away. The bacteria, Bordetella bronchiseptica,is the most common cause of respiratory disease in guinea pigs. Rabbits, cats and dogs can carry this bacteria which can pass to guinea pigs and cause disease. Therefore, guinea pigs shouldn't be housed with rabbits
Copied from the RSPCA website, also
They have different needs (e.g. dietary). Unlike rabbits, guinea pigs cannot synthesise vitamin C which must be provided adequately within their diet. And they can intentionally or unintentionally injure guinea pigs by kicking them or trying to mate with them (can injure the poor guinea pigs back.)

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