Henry is a 10 year old, now neutered canine crossbreed that was referred to us because he had a mast cell tumour on his leg. Following a post diagnosis discussion, Henry’s owner requested a full body scan to rule out splenic hepatic and pulmonary metastasis. Henry was showing no signs of illness. After a full body CT scan the lungs, liver and spleen where clear. No metastasis where found and no lymph nodes where reactive. Although this was clear, we did discover a circular foreign body in the stomach and enlarged prostate. Henry underwent castration and endoscopy to correct this. With the clinical signs of the patient alone it would have been impossible to determine the findings of the CT. This is a great example of the importance of CT.