ICVA NAVLE Prep Online

A recent dietary indiscretion involving rich, fatty foods is a classic trigger for acute pancreatitis in dogs. Pancreatitis commonly causes acute vomiting, diarrhea, abdominal discomfort, lethargy, and dehydration, which fit the history and exam findings. Gastric dilatation-volvulus (GDV) is more typically associated with acute abdominal distension, nonproductive retching, hypersalivation, and rapid progression to shock, rather than primarily vomiting/diarrhea after a fatty meal. Addison's disease (hypoadrenocorticism) can cause vomiting/diarrhea and weakness, but it is often characterized by waxing/waning episodes and is commonly accompanied by electrolyte abnormalities (especially hyperkalemia and hyponatremia), which are not suggested here. Parvovirus infection is most consistent with severe hemorrhagic diarrhea and vomiting in younger, unvaccinated dogs; it is less likely in a 5-year-old with a clear fatty-food trigger.

Rumen fluid analysis is the most definitive because it directly evaluates the rumen environment, including rumen pH (typically decreased in ruminal acidosis) and changes in fermentation and microbial activity. Blood glucose monitoring may show nonspecific metabolic changes but does not confirm rumen pH status. Abdominal ultrasound can assess abdominal organs and motility but cannot directly confirm ruminal acidity. Liver biopsy can identify hepatic pathology secondary to other conditions but is not confirmatory for ruminal acidosis.

Acid-fast staining of a fecal smear has low sensitivity for avian mycobacteriosis because organisms may be shed intermittently or in low numbers, and a smear examines only a small sample volume. A negative fecal acid-fast smear therefore does not exclude infection. Testing that targets affected tissue (culture, PCR, and/or histopathology of lesions with acid-fast staining of tissue sections) is generally more sensitive because it samples sites where organisms are concentrated and where granulomatous lesions are present.