We adopted a 4 year old male cocker spaniel about 9 months ago. Now,
we're thinking about getting a second cocker (we're looking into
possibly getting another adult one from the same rescue group). My
only concern is that our dog now is too dominant to share the house
with another. He's not aggresive around other dogs, he will get into
occasional fights with his cousin - but he's definitely not submissive
(one thing we did learn at a friend's house, when he didn't back down
to their boxer). When we choose a dog, should we choose one that will
be submissive to him, so that he can show them who's boss and there
won't be any horrible fighting. I'm terrified that we'll get a dog
and have to take them back because they both try and be dominant. And
I'm especially scared as we'll be leaving them alone together for 10
hours each day- who knows what could happen when we're not there.
What have been your experiences with this?

Also, is it wise to get a male or female cocker with our male?