Valentine's Day doggie- and kittie-mail through petcentric.com offers a unique way to engage in this year's heart-day hoopla. You can upload a photo of your pet and use it in one of their fun templates or choose one of the pets provided. Add your voice, and your cat or dog will "speak" the words. For every e-greeting sent, Purina will donate $0.50 to shelters across the country. If you are really feeling silly this weekend - Petco will host a Valentine's Pet Party at participating store locations. There will be a Best Pet Kiss Contest.