What food does pet/dog eat?

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I only have 1 baby pet left because others was died and i do not know what reason. And the left one is not eat now much but only little,because he is eating much,active ad now he is lonely. I do not know maybe because his sister and brother died and no ones there to play with him.. And i want him to eat,but he did not eat,and even i give him food not eat. Earlier i gave him beef loof with egg,rice but only eat beef loof but little.....I dont know what his problem maybe because he is alone,no ones play with and etc..because before,he is active and play with his sister,and when his sister died,he is alone,lonely.......... i let him sleep with me in bed because i feel sorry to it......