This is a Sponsored post written by me on behalf of Hills Pet Nutrition for SocialSpark . All opinions are 100% mine. We've been asked by the folks over at Hill's Pet Nutrition to check out their latest  Mobility Challenge that promises a more healthy-feeling dog in one month! If your dog has been having joint issues or weight problems, they are offering those who register for the Mobility Challenge, Hill's Healthy Mobility Coupon that is worth:   $30 in coupon offers AND   An automatic entry in the Healthy Mobility Challenge sweepstakes! 30 Winners will receive FREE PET FOOD for a year! Wow, that's impressive !     Their Mobility Challenge promises:   30 days to improved mobility   30 dollars in coupons 30 sweepstakes prize winners   If you want to learn even more before taking the challenge for your pet, you can follow up-to-the-minute happenings by "liking" their Hill's Pet Nutrition on Facebook page! Sounds like a how...