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However, some cohorts show no association or even contradictory trends depending on age, BMI, or genetic background

Consider discussing B12 testing with your vet if your dog has: Had chronic or intermittent diarrhoea for more than a few weeks without a clear resolved cause Lost weight progressively despite adequate food intake Been diagnosed with a chronic gut condition, such as inflammatory bowel disease or exocrine pancreatic insufficiency A history of poor early nutrition, such as a recently rescued stray or previously malnourished dog Been through multiple courses of treatment for digestive symptoms without sustained improvement A young dog or puppy that is not developing or gaining weight as expected Causes of Vitamin B12 Deficiency in Dogs Vitamin B12 deficiency in dogs is almost always caused by a problem with absorption rather than a lack of B12 in the diet

Beyond this direct chemical defense, NO also functions as a critical signaling molecule, modulating protein function through regulatory S-nitrosylation to actively suppress the ferroptotic cascade

doi: 10.3389/fphar.2025.1632588 Received 21 May 2025 Accepted 28 July 2025 Published 29 August 2025 Volume 16 - 2025 Edited by Yurong Lai, Gilead, United States Reviewed by Daniel Crona, University of North Carolina at Chapel Hill, United States John Prybylski, Pfizer, United States Updates Copyright 2025 Cao, Qian, Wang, Zheng, Huang, Wei, Jiang, Yu, Jiang, Yu, Mao and Zhai

Nonetheless, one must consider the various caveats that accompany their application as biomarkers or therapeutic targets in MDD