Bacon grease is bad for dogs. Consumption of bacon grease can result in pancreatitis, the severe inflammation of the pancreas. Symptoms of pancreatitis include vomiting, diarrhea and organ failure. Pancreatitis is deadly if left untreated, especially in breeds such as miniature schnauzers, Yorkshire terriers and Shetland sheepdogs.
Any type of grease or fat trimmings from cooked or uncooked meats can lead to pancreatitis. Meat bones are also bad for dogs, since they can cause choking and bowel obstructions. Splintered bone fragments can cause lacerations to the tongue and gums. The best way to keep dogs safe from these and other human food hazards is to avoid giving them table scraps.