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.