Is it possible to cascade only the links of a ManyToMany relation and not the related objects?

For example:

I have 2 classes: Person and Dog, which have a many to many relation.
Both are CRUD'ed independently.

Person has a undirectional @ManyToMany relation to dogs:
class Person
{
...

@ManyToMany(
// cascade = {CascadeType.PERSIST, CascadeType.MERGE}
)
@CollectionId(...)
@JoinTable(
name="Person_Dog"
)
public List<Dog> getDogs()...
}

I add 2 dogs A, B to a person C without dogs.

If I don't cascade, the person C doesn't have any dogs.
If I do cascade, changes to A and B are also saved.
What I really want is that the table Person is affected, as well as the table Peron_Dog, but not the table Dog.

Is this possible?
Thanks for any help.

Removing @CollectionId and not only using an update of Person (instead of directly inserting a Person with linked dogs) seems to do what I want.
But why?