Chihuahua in Pacing (image) Friedrich-Schiller-Universitaet Jena Caption Chihuahua in pacing. The movements of 327 dogs from 32 different breeds were recorded with a high speed X-ray video system. Credit photo: Fischer, from: Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.