what does a b12 inject shot do for my dog you're seeing here is being treated diarrhea with a shot. And this isn't a random injection site. It's intentional. The area just above the anus corresponds to Giving Your Cat a Vitamin

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How vitamin B12 works in the body Vitamin B12 works differently than other vitamins, in that a substance called intrinsic factor must be present in the intestinal tract in order for the body to absorb B12

Dose ranges are often species- and model-dependent, with rodent studies using body-weight-normalized doses (mcg/kg or mg/kg) that may be substantially different from the fixed doses used in primate or pharmacokinetic models

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The injection is prescribed to animals including horses, cattle, and dogs

Even a mild increase in Hct or platelets from fluid loss can increase viscosity and potentially trigger thrombosis or microvascular events