How do you get a new family puppy to eat?

My best friend’s family just brought home a new family pet, a black lab. He’s about 9 weeks old, born January 3rd. He loves to play and is doing great with housebreaking. He drinks plenty of water, but he just won’t eat.

Since they brought him home on Saturday, all he’s eaten is part of a dog treat. I’m not a dog expert, but I had a dog for 15 years and when he wouldn’t eat his regular food I would give him a quarter cup of cooked chicken or beef with rice. Sometimes I would put the mixture in with his dry food. Would this be safe for a puppy 9 weeks old?

What else could my friend’s family do to help the puppy eat?