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b12 injection side effects dogs What you're seeing here is a dog being treated for diarrhea with a shot. And this isn't a random site. It's intentional. The area just above the anus corresponds to VITAMIN B12 INJECTION 3000 mcg
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References Ng FM, et al

Walker, K., Shindel, A
[DOI] [PubMed] [Google Scholar] 46.Koc Okudur S., Soysal P

In nature, the chemical form cyanocobalamin does not occur and must therefore be transformed in the body in order to take effect

It depends on the condition you want to treat