There's certainly nothing toxic about adult dog food, and your puppy won't become sick from eating the odd bowl of kibble or stealing morsels from his big-brother's dish (aside, potentially, from some minor digestive upset). However, long-term damage can result from a steady diet of adult dog food.
Can my puppy eat adult dog food?
6–12 weeks: Growing pups should be fed puppy food, a diet specially formulated to meet the nutritional needs for normal development. Feeding adult food will rob your puppy of important nutrients. Four feedings a day are usually adequate to meet nutritional demands.
What happens if you feed a puppy regular dog food?
Puppies need a finely-tuned balance, which many adult dog foods don't necessarily provide. If you do choose to feed your pup adult dog food, then that's okay. Adult food won't necessarily make your puppy seriously ill - it's dog food after all. They may, however, experience an upset stomach here and there.
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