I have a Cocker, Toby and my friend (Looking4puppy) has a Yorkie, Rainbow. Toby and Rainbow are the best of friends! They LOVE to play together. Rainbow lives next door and when I take Toby outside, that's the first place he goes. He stands by the front door and waits for me to open it, then he's off to find Rainbow. They play very well together.
About their size, average cockers grow to be around 14" - 15" tall and weigh between 18lbs-25lbs. They're very LOVING, hyper, and they get VERY attatched to their owner.
Here's Rainbow and Toby: |