Conclusion. For most healthy dogs, the endogenous production of vitamin C is adequate, and routine supplementation is unnecessary. However, in situations involving stress, illness, aging, joint ...

A vitamin C overdose is "extremely rare," Jacobi mentions, as dogs get rid of excess vitamin C through their urine. But if your dog is prone to urinary problems, supplemental vitamin C may not help.

To survive, we don't need to synthesize our own vitamin C. But dogs can, which is why they want bacon, not orange juice. Source: Guy Drouin, Jean-Rémi Godin, and Benoît Pagé. "The Genetics of Vitamin ...