My dog loves apples,plums,pineapplesand a lot of vegetables.will bananas harm him

He must have wet poops a lot. My wolf hybrid loved hard candy. He could unwrap them as well.

To answer your question, one - sure. A bunch - maybe not, they do promote blood clotting.

One of my rescue hounds will eat anything that falls on the kitchen floor, including a clove of garlic one time. Put veggies that he gobbles off the floor into his food dish - he's all "Meh--"