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C, C


A CER is a Conditioned Emotional Response.  CER+ stands for Positive Conditioned Emotional Response, and CER- stands for Negative Conditioned Emotional Response.

A CER is when a dog learns to associate the presence of a stimulus with a (pleasant or unpleasant) consequence, and changes his behavior toward the stimulus as a result. One example is, a dog wags his tail when he sees the leash.  This is a CER+.