I don't only have one dog(we have an English Bulldog as well), but Rasta is my dog and he's only a little over 2lbs. I don't really let him play with our bully since she's so much bigger and thinks she's a lapdog herself
. I'm not really a fan of dog parks due to owner negligence and some dogs are just aggressive. If you have a friend/neighbor that has a small dog that you feel comfortable with letting your pup interact with maybe you can set up a play date? In my situation we're adding another yorkie to our family so hopefully that will help with companionship.