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.