b12 injection excess show up in stool 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 and ulcerative colitis:

Vitamin B12 and ulcerative colitis: Links and more 5 side effects of excessive intake of vitamin B12 @Beatriz Amma story will wake you up to the realities of unnecessary medical interventions #thecheckup Over supplementation with vitamin B12 alters microbe host interactions in the gut leading to accelerated Citrobacter rodentium colonization and pathogenesis in mice Microbiome Springer Nature Link

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