EVERYONE!
Thanks for all the replies and for the advice.
He's okay!

Doctor said, he was just adjusting to the environment on his first 3 days that's why he's really playful. And loves running around the house to be familiar of his territory. Vet said it's normal for a two year-old yorkie to be a little quiet sometimes coz he's slowly maturing.
And yeah, vet said I should make him eat dog food. Rice could make him have worms in his tummy.
Thanks people!
Now, can you suggest food for my yorkie? What kind and how will I push him to eat it? he ignores it. My friend told me I should mix it with other food 40-60% then 50-50& then 60-40% then 80-20% then 100%. Should I go for his advice?