Big Scary Dogs

I need a description of a big scary dog.

For my English work, my character needed the guidance of two big dogs and I needed a good description that would describe their terrifying nature and frighten my character.

Well, here's some OO:

They were big, evil dogs with their heads in the mud. They are sinking in front of their mouths and their sharp teeth are stained with the blood of their little prey. His pale eyes stared straight at the wild madness, and his claws dried the concrete and scratched the ground. The monster pierced the character's ear and came to pick him up.

Water source? o_O

Big Scary Dogs