NAVLE 2025 – 400 Free Practice Questions to Pass the Exam

The most likely diagnosis for an 11-year-old male neutered dog experiencing abdominal pain and hematuria (blood in urine) is transitional cell carcinoma. This condition is a malignant tumor that commonly affects the urinary bladder and can lead to various clinical signs, including blood in the urine, which is often intermittent, and abdominal discomfort due to the tumor's presence in the bladder or surrounding tissues.

Older male dogs, particularly terriers and breeds that are predisposed to urinary bladder issues, are at a higher risk for transitional cell carcinoma. The fact that the dog is neutered is relevant, as this procedure is typically performed to prevent certain conditions like benign prostatic hyperplasia, which can contribute to urinary issues but is less common as a cause of hematuria compared to transitional cell carcinoma in this age group.

The other conditions presented can cause some overlapping symptoms, but they either do not account for the combination of the dog's age and symptoms as effectively or are less common causes in this specific context. For instance, renal calculi may cause hematuria and pain but are less likely to present as a primary cause in an older dog without previous urinary history. Struvite urolithiasis is more commonly seen in younger dogs and is often associated with underlying