The dog chooses “its person” according to clear criteria, but there is one nuance.
Many people mistakenly believe that a dog considers one person to be its owner, and that it doesn’t care about the rest.
A pet loves a person who seems predictable to it, who does not pose a threat, who takes care of it, feeds it, and entertains it.

That is, the dog chooses its person based on the principles of safety and comfort. But none of the experts will say that it can only be one person.
A dog can equally love and appreciate everyone who lives with it in the same territory and treats it well.
Therefore, the statement that “a dog chooses only one owner” is a myth.
If every family member plays with the pet, feeds it and does not show aggression, then the dog will obey and feel affection for everyone, and not just for one person.
One person can steal the pet's love if they start to devote much more time to it than anyone else.
Then one might get the impression that the animal has chosen one and only owner.