My wife has fed her dog apples, grapes, pears, citrus, mango, pineapple, pastries, carrots, tomato, coffee, yogurt, etc. for years as the dog begs for them (not as an everyday thing). It's the first time I'd ever seen a dog eat fruit.
She does have dislikes. I remember that she hates potatoes. If you give her pot roast, she'll east the carrots, meat, and gravy, but she'll separate out the potatoes onto the floor. She's also a nuisance if you try to slip a pill into some mashed up bread.
In everyday life, she's fed rice and whatever's left over from lunch. She's also been on a pretty consistent diet of baby formula since February (she seems to love it).
This has been going on for her entire life (over ten years?), and she seems fine.
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If she were my dog, I'd feed her good dog food.
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