It has been scientifically proven that dogs perceive human speech well and store up to several commands in their memory. But this does not mean that they understand human speech.
But for some reason dog handlers do not advise dog owners to growl at their pets, even as a joke.
The head of the Russian Cynological Federation, Vladimir Golubev, spoke about whether dogs understand human barking and growling on Radio 1 .

At the very least, such attempts may frighten the dog or provoke aggression.
The thing is that dogs react not to words, but to intonation.
Therefore, in the described situation, the dog may react unpredictably.
The expert also reminded that the best form of communication between a person and a dog is the one that is familiar to the animal.
That is, you should use previously learned commands that the dog knows, recognizes and performs well.
Loud screams and other unusual reactions for a pet can cause anger in a dog.
If situations are repeated constantly, then behavioral problems cannot be avoided.
Commands should be given to the dog in a calm voice and a friendly tone.