Yes you can feed your dog bananas and they will not have a detrimental affect on the dog’s health at all. Just keep in mind not to over feed him with bananas because they contain a lot of sugar and that might cause loose stools and constipation. As far as other fruits and vegetables are concerned, I will encourage you to on that because it is very healthy. As far as food prepared for human consumption is concerned, it is not a good thing to feed your dog with food prepared for human consumption because dogs cannot process excess salt present in it. Similarly, chocolate, raw eggs, onion and garlic should also not be given.