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Your puppy needs puppy food. Your adult CAN eat puppy food but it is higher in calories so your older pet might get heavier on it. If this happens, you will have to find a way to separate them.
The lesser of the two evils is for them both to eat the puppy food.
Let me know if you still have questions.
You should feed puppy food for up to a year. If the puppy begins to get too heavy (puppy food is very high in calories) you can switch after 6 months.
I hope this helps!
Puppies are a lot of fun and a lot of WORK!
Thanks again for asking all your questions here. And for your generosity.