What is PRAA video presentation:
https://www.youtube.com/watch?v=-2EZZ8Q5AJo&feature=youtu.be

Links to more information about Persistent Right Aortic Arch (Vascular Ring Anomaly): 
http://cal.vet.upenn.edu/projects/cardiosf/project/praapres/praa.htm
http://tinyurl.com/lkyd5t
http://www.peteducation.com/article.cfm?c=2+2096&aid=870

Other resources:
Buchanan, J.W. 2004. Tracheal signs and associated vascular anomalies in dogs with persistent right aortic arch. Journal of Veterinary Internal Medicine; 18 (4): 510-514.
Adin D.B., Adin C.A. 2011. Vascular ring anomaly. In Cote E, ed. Clinical Veterinary Advisor: Dogs and Cats, 2nd edition (St. Louis, MO: Elsevier Mosby) pp. 1160-1162.
Patterson, D.F. 1996. The genetics of canine congenital heart disease. ACVIM-Proceedings of the 14th Annual Veterinary Medical Forum: 225-226.
This database is a joint initiative of the Sir James Dunn Animal Welfare Centre at the Atlantic Veterinary College, University of Prince Edward Island, and the Canadian Veterinary Medical Association. Comments may be addressed to CIDD@upei.ca. Please note that we are unable to provide medical or breeding
advice. Please contact your veterinarian.
Crook A et al. 2011. Canine Inherited Disorders Database (CIDD).