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My 2 yr old, 80 lb Dogo Argentino gets 325 mg 3 times a day to combat arthritis and chronic ear infections.
https://healthforce.com/education/white-papers/truly-natural-vitamin-c/
As an afterthought ~ vitamin C works in conjunction with other nutrients for it's activation. If you aren't doing a raw diet, where they get their calcium and magnesium (along with so many other nutrients) from eating raw bones, you should supplement. If you are using ascorbic acid or some other isolate form of vitamin c you should also supplement bioflavonoids.
Lastly, Steroids medication deplete vitamin C, so you'll need higher dosage till you wean off the drugs and heat destroys VC so don't do that :o)
Where to Buy
★★★★★