What can i mix my english bulldog with?

Hello all i own a male english bull dog that is about 10 months old and after he turned a year old I am thinking of breeding him to get another dog. I love my english bulldog but i believe he's too big and very mischievous. I am thinking to cross breed with another smaller dog so can anyone give me any advise on which smaller dog should i breed with. I want to hear your experiences on mixing english bulldog breed. it doesnt matter if its smaller or bigger as long as its healthy please feel free to share your thoughts. Thanks in advance.