Possible that it is a Catahoula. I saw a very gray dog with small black spots, and have been looking for this answer myself. So far some Catahoula's are the closest I've seen.
Their mostly black or gray but if its a whale shark brownish with white spots.
The color of a bird is important in bird identification. A whippoorwill is usually a mottled gray, black, and brown; while the underside is pale with gray and black spots.
Furry Brown Black White Gray Fast Cute Jumpy
darkish gray.
Pink. Gray is a lighter shade of black, and pink is a lighter shade of red.
The color of their fur is pure white with dark black spots. They can also have a smoky gray or yellowish fur. The spots could be dark gray instead of dark black spots.
gray with black spots
gray backs white spots on the back and white tummy
when it gets black,gray, or green spots.
A honey golden fur with black gray spots.
Their mostly black or gray but if its a whale shark brownish with white spots.
I believe you are referring to the Grey Rat Snake.
The color of a bird is important in bird identification. A whippoorwill is usually a mottled gray, black, and brown; while the underside is pale with gray and black spots.
The dominant color of the andesite is black with some spots of red and gray. from: http://192.211.16.13/curricular/MN/tieton_andesite.htm
a siamese cat is white but their face,ears,paws,and tails are brown or gray or black
a Blue Merle is a Border Collie that is a whiteish/gray color whit little black spots
They have big ears and gray fur. The ears help to filter heat. The fur is usually gray. They live in mountains, which are also gray.