Yes, Michelle, consuming this kind of fat can be potentially harmful to your dog. While dogs do need certain types of fats in their diet, the consumption of significant amounts, such as the trimmings from a steak, either in one sitting or as a chronic habit, could potentially cause vomiting and diarrhea, or even a life-threatening inflammatory condition of the pancreas known as pancreatitis. Because of this, we recommend that you avoid feeding fat trimmings to your dog.