JPA Hibernate: Post and Get using a foreign key

Question

I am using Spring, but also Hibernate to set up a RESTful service. Unfortunately, I don't know how to work on the weak entity's table when I just have the related foreign key.

I think, it is difficult to explain, let me give you an example:

Imagine we have the class Person and the class Dog. Every Dog that exists has exactly one Person as owner. A Person don't have to own a Dog. However, a Person can have as many Dogs as he or she wants.

Unfortunately, I am not able to show you any code because ctrl+k, or code tags doesn't work, but there are layers for both, Person and Dog:

in Package com.example.person: Person, PersonController, PersonService, PersonRepository

in Package com.example.dog: Dog, DogController, DogService, DogRepository

Now, I am in DogService.java. I want to do two things:

1. Get all dogs of a Person just having the Person's id: My first idea was to use the Query annotation in DogRepository to do something like "... WHERE d.person = ?1". But I don't know exactly how to do that.
2. Post a dog by using the id of the Person: How can I save something to the Repository by using the Person's id? Ususally I would use dogRepository. save(...).

It is like an invisible wall between dog and person in my head. Could you please help me?

Thank you very much!