Someone Or Something Has Been Attacking This Person's Animals (Photographs)

A reader from Tennessee sent us this photograph with some gruesome details about what happened to her cattle dogs (now dead). We replied via email asking for more details about the location. The game cam photograph was taken on November 8th and it shows something crawling around her property. It’s pretty wild:
 

Hello ,I live in rural middle Tennessee  where there are caving systems underground and deep hollows .My next door neighbors are on 52 acres with cattle and have lost 2 cattle dogs . The neighbor on the other side had a dog on a chain and it was brutally attacked with its back leg almost torn off.  I own a farm and I have many  Brazillian Mastiff guard dogs  that live behind a large 6 foot fenced area surrounding my farm house with 6 foot welded metal gates  to keep them inside the area. to guard my house . I have bought game cams because something jumped inside the enclosure and attacked the lead dog who is 152 lbs but did not kill him. The second attack two months later killed a the biggest female because she bleed to death. Underneath the chest area were massive holes the size of a my finger tips and deep scratch marks under each arm pit.Both dogs had the same attack wounds except  the female had one under the rib cage in the solar plexus region and that might have hit  a main artery . It was a gaping hole oozzing blood . When I got home she was cold and half dead  but still lying in an upright position then died soon after. She was a fearless bitch dog. She died November 2012 in a few months  after  around March  on a misty early morning  my 5 Brazillian Mastiff dogs  were at the back fence  raising hell like something bad was out there in the field. I walked outside the gate and peeked around the corner and saw a black figure laying low  along the weeds obviously stalking my five mastiffs unafraid . I tried to identify it  but i could not see the head .I studied  it for a few seconds until it saw me and oddly  shifted its body turning with appendages flopping and shifting and then it glided off without standing up at all. It was creepy .   I have coyotes and deer and possums , coons and skunks BUT I  have no idea what this creature was  . My local  wild life officers do not talk in-debth to me about it and they seem to want to leave when i confront them about it. Last night Nov.16  I inspected the game cam SD card . I found coyotes deer ect the usual but also this creepy black shape . My game cam is set up to take 3 pictures when tripped . This black creature was low to the ground and moved so fast that only one frame caught it. I will send all three . What  is it ??  Its on jpg.  Hunt2049.  I have had 4 cattle horses chased all around the pasture one night a few years ago and went out side to hear unearthly – screeching down in a deep hollow and the next day a large -sprawled  three clawed superficial scratch mark on upper gut area of one of the horses .There are many strange creature sightings and attacks around the counties surrounding that i have gathered from different individuals because of my Job I meet alot of people .