A young Border terrier whose organs became flooded with eosinophils has recovered after a precisely controlled dietary change, offering veterinarians a striking new clue about a rare and potentially fatal inflammatory disorder. The 15-month-old dog developed recurrent attacks of abdominal pain, trembling, vomiting and soft feces, alongside one of the most dramatic eosinophil increases reported in a dog with gastrointestinal disease. Eosinophils are white blood cells involved in immune defense against parasites and in allergic inflammation. When they accumulate excessively, however, they can damage tissues rather than protect them. In this case, eosinophils infiltrated the intestine, liver and lymph nodes, creating a pattern that initially resembled disseminated hypereosinophilic disease. Yet the dog improved without corticosteroids or hydroxyurea—the drugs traditionally used in comparable cases—after switching to a gluten-free, hydrolyzed veterinary diet.
The case, reported in the Journal of Veterinary Internal Medicine, began with a six-month history of intermittent gastrointestinal episodes. Ten days before referral, the symptoms intensified, with acute abdominal discomfort, trembling, vomiting and soft stools. The dog had already received a succession of symptomatic treatments, including maropitant for vomiting, omeprazole, metronidazole, probiotics and analgesics, but the attacks continued to return. Monthly treatment with milbemycin oxime and praziquantel also made common intestinal parasites less likely, although it could not exclude every possible parasitic infection. At the referral hospital, veterinarians detected cranial abdominal pain and several small masses in the middle of the abdomen. The rest of the physical and neurological examination was unremarkable, making the blood results particularly important: the eosinophil concentration was 10.9 billion cells per liter, compared with a reference interval of 0.1 to 1.2 billion.
The blood abnormalities pointed to a much broader inflammatory process. The dog also had increased neutrophils and monocytes, immune cells commonly associated with acute inflammation, while blood chemistry revealed low albumin and severe elevations in liver enzymes. Alanine transaminase reached 1,260 units per liter, compared with a reference interval of 13 to 28, and alkaline phosphatase rose to 313 units per liter, against a reference interval of 12 to 83. Computed tomography provided the next major clue. Several abdominal lymph nodes were enlarged, including hepatic lymph nodes measuring up to 17 millimeters, as well as colic, splenic and medial iliac nodes. The thoracic scan was largely normal apart from a diffuse ground-glass pattern in the rear lung lobes, interpreted as likely atelectasis, or incomplete inflation of lung tissue. Fine-needle samples from the mesenteric lymph nodes showed eosinophilic and neutrophilic pyogranulomatous lymphadenitis, with degenerating cells and material suggestive of necrosis but no convincing evidence of infection.
To determine what was happening inside the affected organs, the veterinary team performed an exploratory abdominal operation and collected tissue from the jejunum, liver, jejunal lymph nodes and iliac lymph nodes. The jejunum showed marked eosinophilic enteritis, meaning that large numbers of eosinophils had penetrated the intestinal wall. Liver samples revealed chronic active hepatitis with portal and bridging fibrosis, increased fibroblasts and a dense eosinophilic infiltrate. Some cells contained pigment that initially appeared to be iron-rich hemosiderin, but a specialized Perl’s Prussian blue stain showed that much of it was not iron. The pigment was therefore more consistent with lipofuscin or ceroid, compounds that accumulate after cellular injury. The lymph nodes displayed reactive follicular hyperplasia and increased immune-cell populations, but no clear primary lymphadenitis. Cultures for aerobic, anaerobic and fungal organisms were negative, apart from Enterococcus recovered from enrichment broth; because bacterial numbers were scant and tissue showed no infection, the organism was considered a contaminant.
The investigators worked through several possible explanations before turning more closely to diet. Eosinophilic infiltration of the intestinal tract is associated with parasitism and dietary hypersensitivity, while eosinophils can also rise in response to cancer, respiratory disease, skin disorders, endocrine illness and other inflammatory conditions. The dog’s routine parasite prevention, the absence of visible parasites during surgery and the lack of parasitic structures in tissue made infection less likely, although veterinarians prescribed a five-day course of fenbendazole as a precaution. The young Border terrier also displayed muscle cramping and a hunched posture, features that prompted testing for paroxysmal gluten-sensitive dyskinesia, a condition reported in the breed. Its anti-canine gliadin immunoglobulin G level was elevated, whereas the anti-transglutaminase-2 immunoglobulin A result remained within the stated reference range. The clinical picture did not meet the full pattern of that neurological disorder, but the antibody result strengthened the possibility that gluten or another dietary component might be provoking an abnormal immune response.
A hydrolyzed and gluten-free diet was recommended, alongside short-term fenbendazole and medications intended to support liver function. The first dietary change, however, was not actually gluten-free or hydrolyzed. Four weeks later, the owner still reported intermittent vomiting, small-bowel diarrhea and abdominal discomfort. Once the dog was switched to a genuinely gluten-free, hydrolyzed food, the laboratory results changed rapidly. Two weeks after the correct diet began, alanine transaminase fell from 1,260 to 77 units per liter, and alkaline phosphatase dropped from 313 to 44. Albumin increased from 25 to 29 grams per liter, while the neutrophil and monocyte abnormalities normalized. The eosinophil count fell to 2.05 billion cells per liter, still mildly above the laboratory’s reference interval but dramatically lower than at presentation. Liver-support medications were then discontinued, allowing the dietary intervention to be observed without those treatments confounding the result.
The improvement continued. At a later follow-up, the dog had experienced only one further episode of vomiting and abdominal discomfort, apparently after scavenging cooked turkey outdoors; the episode resolved without treatment. Two months after the earlier blood test, the eosinophil count had returned to the reference interval at 1.16 billion cells per liter. The owner reported complete and sustained resolution of the gastrointestinal signs. Although the liver was not biopsied again, the normalization of alanine transaminase alongside the resolution of eosinophilia strongly suggested that the hepatitis, like the intestinal inflammation, was responsive to the diet. The authors describe this as the first reported canine case in which concurrent eosinophilic enteritis and eosinophilic hepatitis appeared to resolve through dietary modification alone. Because other interventions were used initially, the report cannot prove that the diet was the sole cause of recovery, but the timing of the response—particularly the persistence of symptoms while the first, unsuitable diet was being fed—provides a persuasive clinical signal.
The finding matters because disseminated eosinophilic disease in dogs can look alarmingly similar to hypereosinophilic syndrome, a diagnosis associated with persistent circulating eosinophilia, organ infiltration and clinical illness. Previous canine cases have involved the gastrointestinal tract, liver, spleen, lungs, lymph nodes, bone marrow, heart, pancreas, skeletal muscle, skin or kidneys, and some have been fatal. Successful treatment has generally relied on combinations of prednisolone, which suppresses immune activity, and hydroxyurea, which reduces the production of blood cells in the bone marrow. Those drugs can be valuable when immune-driven disease is confirmed, but they also carry potential risks and may obscure an underlying dietary trigger. The new case does not mean that every dog with eosinophilia has a food allergy, nor that owners should attempt an unstructured food switch. It does suggest that, after parasites, infection, cancer and other causes have been investigated, a carefully supervised trial of a truly hydrolyzed, limited-antigen diet deserves consideration—especially when gastrointestinal symptoms coincide with eosinophils infiltrating multiple organs.
For veterinarians, the case also highlights how easily a dietary trial can fail if the replacement food is not formulated for the purpose or if the animal receives unapproved treats. Hydrolyzed diets contain proteins broken into smaller peptide fragments, theoretically reducing recognition by immune cells that react to intact dietary proteins. A gluten-free formulation removes a specific group of cereal proteins that may be relevant in susceptible animals, although the mechanisms linking gluten exposure to this dog’s disease remain uncertain. The elevated anti-gliadin antibody cannot by itself establish causation, and the study concerns a single animal rather than a controlled experiment. Even so, the dramatic fall in eosinophils, liver enzymes and clinical signs after the correct diet was introduced turns an obscure veterinary case into a memorable lesson in diagnosis: an immune disorder that appears to be spreading through the body may, in some patients, be driven by something entering through the mouth.
Subject of Research: Dietary-responsive disseminated eosinophilia in a young Border terrier
Subject of Research: Biology
Article Title: Dietary-responsive disseminated eosinophilia in a border terrier
Article References: Barton, J., Gomes, S. A., van Lelyveld, S., White, R. N., & Richardson, S. (2026). Dietary-responsive disseminated eosinophilia in a border terrier. Journal of Veterinary Internal Medicine. https://doi.org/10.1093/jvimsj/aalag133 Original publication
Image Credits: AI Generated
DOI: 10.1093/jvimsj/aalag133
Keywords: canine eosinophilia, Border terrier, hydrolyzed diet, gluten-free diet, eosinophilic enteritis, eosinophilic hepatitis, hypereosinophilic syndrome, dietary hypersensitivity
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SCIENMAG. “Border Terrier’s Widespread Eosinophilia Improves With Dietary Changes.” Scienmag, 28 August 2026, https://scienmag.com/border-terriers-widespread-eosinophilia-improves-with-dietary-changes/. Accessed 28 August 2026.
SCIENMAG. “Border Terrier’s Widespread Eosinophilia Improves With Dietary Changes.” Scienmag. August 28, 2026. https://scienmag.com/border-terriers-widespread-eosinophilia-improves-with-dietary-changes/
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