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:
- Better be the head of a dog than the tail of a lion
- It is enough to make a cat laugh
- When the cat is away, the mice will play
- Love me, love my dog
- The moon does not heed the barking of dogs
- To call off the dogs
- Curiosity killed a cat
- A cat in gloves catches no mice
- The scalded dog fears cold water
- The dogs bark, but the caravan goes on
- Dumb dogs are dangerous
- An old dog barks not in vain
- Beware of a silent dog and still water
- A shy cat makes a proud mouse
- A good dog deserves a good bone