Intermammary mass in a 13-year-old intact female Spanish Alano dog

A 13-year-old intact female Spanish Alano was presented to the dermatology service of the Veterinary Hospital, School of Veterinary Medicine, Zaragoza, Spain, for evaluation of the presence of an intermammary cutaneous mass located on the left ventrocaudal area, which had been growing for several months. Clinical and Gross FindingsAt the initial physical examination, the dog was alert, with a bodyweight of 14 kg and body condition score of 3/5, normothermic, properly hydrated with pink mucous membranes.The dog's abdomen was distended without painful palpation, with absence of organomegaly or the presence of internal abdominal cavity palpable masses.Cardiac auscultation was within normal limits.Respiratory sounds were also normal, and there was no evidence of lymph node enlargement.On dermatological examination, 2 X 2 cm, erythematous and ulcerative nodular mass located on the left caudal intermammary zone was detected (Figure 1).Different clinical pathology tests were performed including a CBC, complete serum biochemical profile, urinalysis, and serum protein electrophoresis.However, all parameters were within the reference ranges.Abdominal ultrasonography did not reveal the presence of abnormalities of the echogenicity in the abdominal organs.Formulate differential diagnoses, then continue reading.