Ein

Ein is one of the main characters of the anime series Cowboy Bebop. He is a 'data dog'; a Pembroke Welsh Corgi whose intelligence was greatly enhanced by a research facility, although exactly what was done to increase his intelligence is never fully explained in the series.

Ein's Intelligence
Despite Ein's enhanced intelligence, he remains incapable of speaking (other than barking). Because of this, his intelligence largely goes unnoticed. It does seem that Ed understands Ein through his body language and barking, however this is never made explicit. Ein also barks once for yes and twice for no.