This is the 84th most frequent Slovak word.
ktorého
"Which" or "of which" (masculine genitive form).
Here, 'ktorého' indicates possession and functions as a relative pronoun modifying 'the dog'.
Mám psa, ktorého meno je Max.
I have a dog whose name is Max.
In this case, 'ktorého' relates to 'the house', showing a possessive connection with 'the owner'.
To je dom, ktorého majiteľa poznám.
That is the house whose owner I know.
In this sentence, 'ktorého' is a relative pronoun in the masculine accusative singular form, referring to 'the boy' as the object of the clause.