Question: Why is it bad to feed dogs human food?

So I had this dog and we fed him all our leftovers. He eventually refused to even look at dog food (he was kinda uppity). We had to put him down when he was 18 (older than me at the time) because we would leave him at home and when we got back he was all dirty from falling down while peeing and was losing his sight. But before all this he was very healthy. Never had worms or fleas or falling out hair or anything. But later I read it was bad. does it depended on the dog. He was a shiba inu/ shih Tzu mix



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