Animals and paranormal activity/spirits

So lately I have been watching this show called A Haunting or The Haunting one show just has families and the other show has animals and families actually both do have animals but only some episodes have animals.

Well I learned alot from those paranormal shows and having spirits the evil kind come through your home.

One thing I will never understand what is it that makes the spirits come back to haunt us. When i watched the show  a girl was burried alive under ground it was illigal to get an abortion back then and they killed the girl and burried her alive under ground and killed her by throwing rocks on to her until she died. and one other girl was burried in the wall. so I question it as okay if we burry them improperly and they come back to haunt us does that meand that they just want a better burrial and to aleast find peace and rest knowing they are burried the right way id hate to be burried in a wall i mean i know your burried under ground but thats not right being burried the wrong way. I know if i was to see my grandma she wouldnt hurt me or us cause i know she loves us and would never dare do that.

As well for animals i have learned they can sense the spirits before we humans can like this guy in Africa died and he had something to do with Elephants and when he died the Elephants walked 12 miles to his house to mourn. And what makes them do this is cause we love them unconditonally.
And for a hospital they have a cat as a grim reaper and the  cat senses when the person is going to die and will go sit on the edge of their bed until that person has died. Which is weird how animals can sense that and i think thats how Mittens felt in the situation of loosing grandma she knew something was wrong even though she was in her room downstairs she sensed that something is going on which is the coolest thing to know that animals really can sense things better then we can. They deffiently know when something is wrong.