The incidence of brain tumors most often sited is 14.5 in 100,000 dogs (Vandevelde 1984). The purpose of this paper is to review the general concepts and current practices in the diagnosis and treatment of canine brain tumors. Elaboration on each tumor type is beyond the scope of this paper, though many important features reviewed in the literature are useful in diagnostic and prognostic considerations. This paper focuses on the principles behind the diagnostic imaging techniques of CT and MRI. It is my hope that the target audience of my peers will find the information herein useful.