Scientists are too lazy to do the health research behind various fruits - hence the reason why most people today don't even know that grapes have a toxic effect on dogs (some books today still recommends feeding dogs frozen grapes as treats).
A lot of people just play it safe and give them veggies. Most dogs love carrots, lettuce, and some like cooked corn.
In fact, dogs can't even taste anything sweet - their tongues don't have the right tastebuds - making fruits/sweets even more worthless for dogs.
EDIT: While sweets/fruits make doggy breath stinky, veggies actually seem to improve their breath! One of the main reasons why I like giving them carrots. They didn't like carrots at first but just like monkeys, when they see you eating carrots, they'll eat them too.
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