Ein

Ein (Born ??) is a Pembroke Welsh Corgi who's intelligence was greatly enhanced by a research facility.Ein is known as a "data dog." What exactly was done to increase his intelligence is unknown.

Abdul Hakim stole Ein from this facility and Spike Spiegel ended up with Ein while attempting to apprehend Hakim (Session 2: Stray Dog Strut). Ein remains a constant and important fixture in the Bebop cast up until (Session 24: Hard Luck Woman).
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.

Signs of Intelligence

• When Spike and Hakim are fighting on the bridge, Ein jumps down to the passing boat to escape.
  
  
• Immediately after that fight, Ein is seen barking. Spike says "shut up, I'm not in a good mood", and Ein ceases barking and lets out a small whimper, clearly understanding Spike.
  
  
• When Hakim is escaping with Ein in the car, Ein jumps onto the steering wheel and pushes several buttons in an attempt to steer the car off course. This incident doesn't technically count because Hakim likely knows how intelligent Ein is.
  
  
• Ein answers Faye's incoming call on Ed's computer. Faye thinks nothing of it, and mumbles about wanting someone who can talk.
  
  
• In a preview for the next episode, Ein manages to speak its name, "Wild Horses". Spike hears this and is shocked, but seems to brush it off. Being a preview skit, it's very likely this is not considered canon.
  
  
• In order to avoid having a human member of the Bebop crew be enlisted into the radical religious cult, S.C.R.A.T.C.H., Ein is put into the headgear that is used to link to the cult's website. Within seconds of being logged into their virtual lobby, Ein himself hacks into the underground portions of the site.