A 10-year-old, 24-kg spayed female treeing walker coonhound was presented for a 3-month history of anorexia, lethargy, weight loss, and a newly auscultated heart murmur.
According to the owners, the dog lost interest in eating 3 months earlier and became lethargic several weeks prior to presentation. No vomiting, diarrhea, or change in thirst or urination was reported.
In addition, the owners described an intermittent weight-bearing lameness/stiffness in the hindlimbs. The lameness began in the right hindlimb approximately 1 month earlier, then shifted to the left hindlimb.
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The patient was a hunting dog, lived outdoors with 30 other dogs, and was mostly unsupervised. Due to progressive lethargy and lameness, the dog had not been hunting in several weeks. The dog had no previous health problems or trauma, was vaccinated 10 months earlier, and received monthly heartworm preventive (ivermectin) but no flea or tick preventive.
The dog was quiet but panting. Body condition score was 3/9. Its mucous membranes were pink, rectal temperature was 102.9° F, and heart rate was 100 beats/min with normal sinus rhythm. A grade III/VI left basilar diastolic murmur was auscultated. Femoral arterial pulses were bounding, synchronous, and symmetrical. The dog was ambulatory and had a normal gait. No joint swelling or pain was noted, and no neurologic abnormalities were detected.
Hematologic abnormalities included leukocytosis characterized by mature neutrophilia (15 ¥ 103/mcL; reference interval, 2.84–9.11) and mild monocytosis (1.064 ¥ 103/mcL; reference interval, 0.075–0.85). The patient was hypoalbuminemic (albumin 2.3 g/dL; reference interval, 2.5–4.4) and globulins were 4.4 g/dL (reference interval, 2.3–5.2). Urinalysis findings included a urine specific gravity of 1.025, with no proteinuria, glycosuria, pyuria, or cylindruria.
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