Possibly the most controversial water-soluble vitamin is vitamin C. Many breeders and dog owners claim that vitamin C helps reduce the incidence and severity of bone and joint problems such as hip dyspepsia in large, fast growing breeds of dogs, but there is currently no scientific research to confirm this. Unlike humans, dogs synthesize their own vitamin C, so many nutritionists believe there is no reason to add it to a dog’s food.
On the other hand, there may be circumstances in which dogs are not able to synthesize sufficient vitamin C, either genetically or in case of severe illness. For example, in one study, racing sled dogs supplemented the vitamin C were able to run farther and remain more stress free than their partners who received a placebo. So, in growing, ill, or hard-working dogs, supplying vitamin C as a supplement may be helpful.
The only problem is that we don’t know how much vitamin C a dog requires for health and how much for healthy dog is able to synthesize. If you decide to give your dog vitamin C, don’t feed her megadoses. A dose of 50 milligrams a day is fine for small dogs and 1000 milligrams a day will suffice for large dogs or just use DoggieWater for your pets needs.