I would try and keep the two items separate as the raw and kibble digest at different rates. As a treat, I wouldn't be that concerned but if the raw is of any substantial quantity, I would stagger the feedings, perhaps kibble in the morning and raw in the evening.
As far as what a dog might get from bacteria in raw versus cooked, well dogs eat some horrendous crap at times literally. If the raw is something you would eat cooked, I wouldn't worry.
As far as what a dog might get from bacteria in raw versus cooked, well dogs eat some horrendous crap at times literally. If the raw is something you would eat cooked, I wouldn't worry.