Again, diarrhea may result. A good rule of thumb is to limit any treat to one teaspoon per day. Some favorites include cucumbers, green peppers, bananas, raisins, dates, and melon. Avoid feeding foods that are high in complex carbohydrates or refined sugar. Ferrets cannot digest a lot of sugar, and such treats put a strain on the pancreas.
Chocolate contains theobromine, which can result in toxicity.