
I've been feeding my dog raw for somewhat over a year (lost track of time now!) and very very occassionally he will bring up small bits of bone - 99% of the time it is the morning after he's had a pig leg for breakfast the day before. The first time it happened I asked about it on one of the yahoo raw feeding groups and several people said, in their opinion, it was completely normal and happens when the stomach has had enough of digesting the item and decides to return to sender :D I do believe it's affectionately termed "BBBV" (bile and bone bits vomit). Is it bile you're seeing, or proper sick with other bits of food in?
Having said all that I'm not sure regarding the being sick after the sausages. Food intolerances would more commonly cause the squits though, but I guess you never know!