The *only* reason I was able to get the Seafoam Unicorn is because I decided to speed breed for Saintly Bernard. If there weren't an animal I was interested in speed breeding for, never would have finished. I think I spent about 300 gems, but it might have been more. I got a whole Kennel full of Captain K9, but of course I had to sell most of them due to lack of space.
Also got some extra Station Dalmatians, but only kept one extra. I grew him up to level 4 and used him to breed with, and I *think* I'm getting Saintly Bernard at last. Not positive yet, though. The other benefit of speed breeding was getting more bombs to mine for runes with. Got enough to buy the Hal of Heroes habitat.