The small intestine has a short diameter but has a length that is about 3-4 times your dog’s body length. Any food material that enters the small intestine is mixed with secretions from the pancreas and gall bladder which break the food material down into smaller units for easy absorption of nutrients (proteins, fats, sugars). Dietary carelessness is the major cause of small intestine inflammation/diseases for example eating rotten food. However, it can also occur due to foreign body ingestion, change in diet, viral infection, and parasites. Dogs having a small intestine disease do not feel well and experience the symptoms of vomiting and diarrhea.