not all foods so be careful otherwise certain foods also can be very healthy for dogs certain healthy results:
skin softness
smell increases
senses
and a healthy weight
or diet
You can feed him or her human food, but just not regurlarly. Maybe for a treat, but you shouldnt give him or her something small that would choke him, or you should give him or her candy or chocolate. Nothing with that kind of calories and sugar. Maybe some raw meet for a treat and rice if he or she is not feeling well, but you really dont want to risk it.
No, they do not, but regular human food isn't good for your dogs.
Wool allergies, flea allergies, food allergies, and skin allergies that can be genetic. (My CC has allergies.)
http://www.the-puppy-dog-place.com/dog-food-allergies.html has some great information about dog allergies. This websites tells us that dogs may be allergic to beef, dairy, and even corn when it is an ingredient in their dog food. This site also has a list of human foods that dogs can be allergic to.
My GSD is currently suffering from horrible itchy, dry, "Skin allergies". My vet told me to look for a food without brewers yeast/rice so I would assume that YES it can cause allergies in some dogs. Like humans, allergies vary depending on genetic make-up.
Milk and milk-based products can cause diarrhea and other digestive problems for your pup. They can also trigger food allergies, which can cause them to itch.
Nuts eggs and the immune system
all the time
Some allergies can be severe enough to cause death. Peanut allergies are a prime example.
I am only familiar with Addison's disease in dogs. To the best of my knowledge it does not cause food allergies or a bad gall bladder. If a person/animal has not been diagnosed with Addison's Disease yet, some of the symptoms might mimic food allergies and gall bladder problems. The best thing to do is to contact you physician.
they cant have all types of human food
Food allergies in dogs are typically treated through avoiding the allergen - there are a dozen or so hypoallergenic and novel protein foods available through your veterinarian.
The most common food allergy is peanut allergy