This is the 13698th most frequent Turkish word.
köpeğin
"Köpeğin" means "your dog" in English.
In this sentence, 'köpeğin' is in the possessive form indicating 'your dog.' It shows ownership.
Köpeğin dışarıda koşuyor.
Your dog is running outside.
Here 'köpeğin' is used to indicate possession ('the dog's barking'). It acts as a genitive form describing the noun following it.
Köpeğin havlaması sustu.
The barking of the dog has stopped.
In this example, 'köpeğin' indicates possession ('the dog’s tail') and is followed by the word it possesses in a descriptive way.