June Boon 
Two Dimensional & M-mode Echocardiography for the Small Animal Practitioner [PDF ebook] 

A concise, easy-to-use manual of basic two dimensional and m-mode echocardiography for the non-specialist. This handy book includes original line drawings that demonstrate proper placement of the ultrasound probe for the study of specific cardiac and great vessel structures, and to show normal cardiac anatomy. Common congenital problems i