A 13-year-old spayed female Pomeranian presented with a mass in the left eye. Slit-lamp examination, ultrasound, and CT revealed an iris-derived mass extending to the sclera, suspicious for scleral invasion. A partial iris biopsy was performed. Histopathology confirmed an anterior uveal melanocytoma with no malignant features. Despite imaging findings suggesting invasion, the patient was managed conservatively with topical anti-inflammatories post-biopsy. Over a 7-month follow-up period, the lesion remained stable, and vision was preserved without complications. This case highlights the importance of histopathology for accurate diagnosis and management of canine uveal melanocytic neoplasms, as conservative management can be a viable option.

A 12-year-old spayed female Pomeranian (weighing 2.4 kg) was referred with primary complaints of acute dyspnea, cough, and lethargy. Diagnostic imaging studies found degenerative mitral valve cusps, chordae tendinae rupture, severe mitral regurgitation (5.45 m/s of peak velocity), and marked left atrial and ventricular dilation. The dog was diagnosed as having degenerative mitral valve disease (DMVD) with ISACHC stage IIIa heart failure. Her clinical condition was stabilized after administration of cardiac medication (e.g. diuretics and pimobendan). Ten months later, the dog was referred back to the clinic due to a sudden worsening of clinical signs. Echocardiographic study found pulmonary hypertension in addition to DMVD. After medication was adjusted, clinical signs were stabilized in 2 weeks. The patient was returned after 4 months for cardiac recheck and there was no obvious worsening of clinical signs. Incidental finding of a left-to-right atrial septal defect from rupture of the atrial septum secondary to marked left atrial dilation by DMVD was noted by echocardiography. To diminish left atrial volume overload, the frequencies of both furosemide and pimobendan were increased (i.e. from q 12 hr to q 8 hr) in addition to adding spironolactone (1 mg/kg q 12 hr). Based on diagnostic findings, this case was re-diagnosed as acquired atrial septal defect secondary to rupture of the atrial septum with advanced stage DMVD. The dog was then stabilized and is currently being regularly monitored.

A five-month-old female pomeranian dog (weighing 0.95 kg) with a history of cyanosis, exercise intolerance, and delayed growth presented to Veterinary Teaching Hospital, Gyeongsang National University. Findings on diagnostic imaging studies showed a dextropositioned and over-riding aorta, pulmonic stenosis, ventricular septal defect, right ventricular hypertrophy, and atrial septal defect. Based on the diagnostic findings, the dog was diagnosed as a case of tetralogy of Fallot with atrial septal defect (pentalogy of Fallot).