To teach the dog to bark
Учить собаку лаять (т. е. ломиться в открытые ворота).
Ученого учить - только портить. Рыбу плавать не учат. Не учи плавать щуку, щука знает свою науку.
Другие пословицы:
- Don't keep a dog and bark yourself
- The cat shuts its eyes when stealing cream
- Beware of a silent dog and still water
- Care killed the cat
- A shy cat makes a proud mouse
- All cats are grey in the dark (in the night)
- To call off the dogs
- Every dog is valiant at his own door
- When the cat is away, the mice will play
- You cannot teach old dogs new tricks
- Wait for the cat to jump
- Every dog has his day
- An old dog barks not in vain
- A cat in gloves catches no mice
- Curiosity killed a cat