I wanted to talk about animals and the paranormal. Animals have heighten sense compared to humans. Since most animals are hunters, they possess keen smells and observatory senses. Audio, sights and smells make animals more susceptible to the paranormal. Animals don't have the ability to lie or fabricate the truth, they can only react. A dog on an investigation is a great tool, because they can sense more than a human can. If a dog is to hit on an area with paranormal activity, you can probably catch good evidence via EVP, Thermal or Infrared.
Just keep in mind that alot of place claiming paranormal activity will not allow animals in to their areas. On local investigations, make sure you remind the client that you would like to bring in an animal to help in your investigation.