WHY do you keep comparing animals to humans? All humans will
  have similar capabilities because all humans are similar to each
  other, even if they're deaf or dumb humans -they're still humans
  and have the same basic capacities.

  Dogs are dogs. They have their OWN similar capacities because
  all dogs are similar to each other.

  Our ability to fully comprehend a species we can't completely
  communicate with will always be limited. Among fellow humans, we
  can tend to find a way, even if some of their input or output
  mechanisms are broken.