Battle between God and Satan
Christ Jesus never kept dogs and cats, although He sometimes mentioned sheep.
Rather, He said not to give treasures to dogs and pearls to pigs as they were not thankful. And He also said that no parents would give serpents to their children.
However, He also preached that God took care of birds in the sky and flowers in the fields, adding that men were more valuable than sparrows to be sold at a petty amount of money.
Indeed, the Bible read as follows: God loves one more than another or ones more than others. Hence, God chose the Hebrews and Abraham, which should be the basics of faith and religion in the mankind.
This might be understood based on the notion that God always minds the battle against Satan. Anybody, any creatures, any living things, and even any things that are apt to be easily subject to Satan's influence should be alienated.
The most important thing for God should not be happiness of any man or any group of people but His victory over Satan. It means that we have to sacrifice our happiness if necessary to defeat Satan by joining God.
However, the secret about this battle between God and Satan still remains for men.
Anyway, the Gospels should be read from this point of view, in my view.
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Mat 7:26 And every one that heareth these sayings of mine, and doeth them not, shall be likened unto a foolish man, which built his house upon the sand:
Mat 7:27 And the rain descended, and the floods came, and the winds blew, and beat upon that house; and it fell: and great was the fall of it.