Out of a dog’s mouth will never come ivory tusks

Similar sayings:

How can you expect to find ivory in a dog’s mouth? How can you expect to find ivory in a dog’s mouth?
A rumour goes in one ear and out many mouths A rumour goes in one ear and out many mouths
Donkey’s lips don’t fit onto a horse’s mouth Donkey’s lips don’t fit onto a horse’s mouth
Honey in his mouth, knives in his heart Honey in his mouth, knives in his heart
Dogs do not dislike poor families Dogs do not dislike poor families

Chinese sayings and proverbs