My girls love fresh foods, be it veggies, or meat scraps, or whatever.
They try to stand under the cutting board when we are prepping veggies especially, lettuce, tomatoes, and red bell peppers, are favorites, although they won't turn away from many, if any vegetables at all. Fruit, they eat it all, but LOVE berries. Apricots and sweet white peaches, fresh off the trees, even Valencia/navel oranges off the tree are also favorites. I think domesticated dogs are omnivores like bears, at least opportunistic eaters. LOL What ever is fresh and in-season!