In a letter to the Veterinary Record, Olaf Swarbrick, of West Sussex, said the features of the 360ft by 130ft chalk animal, made it look more like a greyhound.
But last night Uffington residents roundly dismissed the claims about the landmark, thought to date back to 1250BC.
In his letter Mr Swarbrick wrote: “Looking at it again, it seems that it is not a horse at all.
“The tail and head are wrong for a horse and more suggestive of a dog.
“It appears more like a large hound at full stretch.
“I thought it may be a greyhound, but an anthropologist suggests it is a wolfhound, which, assuming it is not a horse, makes more sense.”