How to Restore the Nutrients to a Dog's System?. Part of the series: Puppy & Kitten Care. If your dog's lost weight due to recent or ongoing illness, you can use Pedialyte or a slurry of highcalorie pet food and water to help restore the nutrients to its system. Learn about the options, including catheterization and feeding tubes, in this free video on puppy and kitten care. Read more: http://www.ehow.com/video_8405851_res...