Sweetie, how much chicken are you feeding your dogs? If they're not used to it, then it will upset their stomachs. And, sorry, but is the "farting" comment under your avatar a joke, or was it meant to be serious?
Unfortunately, just like us humans, chicken can cause severe gastrointestinal problems for dogs, even more so than us. Their digestive system cannot handle what ours can, and large quantities can cause severe gas, extreme abdominal pain and diarrhea.
Of all the dogs I've had, I've learned to only give them small portions of table scraps (3-4 Tablespoons at the most within a 12-hour period of time), whether it's chicken meat, steak fat, eggs, bread, etc. Anything more than that, they've all either barfed it up, or developed gas, diarrhea or constipation, which was extremely painful for them.
Some dogs can actually be raised on "people food", but, IMO, it's cruel to do that to a dog. Some may gradually accept it with no problems, however, others never completely accept it. So, even giving your dog "people food" along with its "dog food", the quantity should be very limited. Nutrition is the key. If they cannot digest the people food, then they lose the nutrients they need. Dog food is always best as a primary source of nutrients.
Also, I've never given my dogs chicken or turkey bones (raw, baked, boiled or otherwise), as I feel that it can still splinter their stomachs, especially if it's not chewed up properly ... and if there's smaller bones attached to the larger bones, they can become deadly to a dog. Giving raw chicken or turkey meat and/or bones (or even raw beef) to a dog ... I would never subject my babies to the dangerous bacteria ... but that's just my personal opinion.