It's BS and obviously not true. Could have done a better rumor than this.
"4: There are animals in the game from dogs to cattle but at this time it is not confirmed if you will be able to harm the animals. Rockstar were able to get away with it in RDR as it was a true depiction of the world in which the game was set. Allowing dogs/cattle to die in a game sent in current times may cause headaches with PETA. Its unclear if Rockstar were joking here."
"The cops are much, much, much more realistic. If you kill somebody when you know there are no cops around you will not run the risk of a one star as often as you would in GTA4. The cops will use smoke and tear gas, dogs, riot gear and rams to knock down the doors of buildings you are hiding in."
So your telling me the police will have invulnerable dogs...