What early clinical or diagnostic markers suggest subclinical chronic enteropathy in dogs?

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Hypocobalaminemia is the strongest early serologic marker of subclinical chronic enteropathy (CE) in dogs, outperforming serum folate as a biomarker of disease. Cobalamin concentrations are lower in CE dogs (median 343 µg/L) than in non-CE dogs (median 550 µg/L), and cobalamin correlates with both albumin and cholesterol — two additional markers of disease severity. 1 Serum folate is an inferior early marker and should not be used as a primary screening tool. Contrary to the historical assumption that hypofolatemia signals proximal intestinal disease, folate concentrations are actually higher in CE dogs (median 12.1 µg/L) than in non-CE dogs (median 10.4 µg/L). Hypofolatemia does not associate with clinical severity scores, albumin, or other markers of CE. 1 Hypoalbuminemia and hypocholesterolemia are clinically meaningful early indicators of disease severity. Both correlate with hypocobalaminemia in CE dogs, and hypoalbuminemia — when severe enough to indicate protein-losing enteropathy (PLE) — carries a recognized negative prognosis. 113 Hypoalbuminemia, hypocobalaminemia, hypovitaminosis D, marked endoscopic duodenal lesions, and a high Canine Inflammatory Bowel Disease Activity Index (CIBDAI) score are all recognized negative prognostic factors in canine CE. 13 The neutrophil-to-lymphocyte ratio (NLR) is elevated in dogs with severe CE compared to those with mild CE, making it a routinely available CBC-derived marker that can flag more advanced subclinical disease before other abnormalities are apparent. 2 Serum C-reactive protein and fecal calprotectin can assess disease severity and treatment response, and are among the few biomarkers used in routine clinical practice for CE evaluation. 5 IgA-based serologic panels — including anti-OmpC (ACA), anti-canine calprotectin (ACNA), and anti-gliadin peptide (AGA) — are poorly specific for CE and should not be used as early screening tools. At a serum ACA concentration ≥15 EU/mL, sensitivity for CE diagnosis is 86.7%