Cool post from Blog Business World:
How to feed your healthy dog
Dog food: Selection and feeding
Note that the first title style is straight forward. The second title places a keyword phrase at the important front end, and expands on the topic after a colon. Both title styles are effective for blog SEO. I suggest you try using both styles on your blog. Note that this post uses the keyword phrase colon phrase format.
Personally I’d go with the second title as it contains an actual keyword phrase (wordtracker says “dog food” gets 700+ searches a day).