That's one of the smarmy questions that Okcupid uses to learn about people..
Honestly, it makes sense... a dog lover doesn't want to be dating a dog hater. I like dogs, have owned several. I'm currently dating a man who dislikes dogs... intensely. Fortunately, he's come into my life when I am petless.
As far as liking animals more than humans..It really depends on the animal and the human... Comparing a delightful loving animal with a poorly behaved human isn't fair... neither is comparing a delightful loving human with a poorly behaved animal.