The most common and most likely answer to this crossword clue is the 8 letter word EOHIPPUS which also is the latest solution we found used in LA Times in 2008.
Dog-sized creature thought to be the horse's earliest ancestor crossword clue answers
Here's a list of possible crossword answers ranked by the most likely to least likely.
| Answer | Likelyness | Letters | 
|---|---|---|
| EOHIPPUS | 100 % | 8 | 
Words with a meaning similar to the clue: Dog-sized creature thought to be the horse's earliest ancestor
These words may or may not be a possible solution to this crosswords clue.- eohippus
 - dawn horse
 - old
 - horae
 - father
 - bloods
 - groom
 - thoroughbred
 - head
 - horsecar
 - ass
 - heeled
 
Crossword Answer definitions
EOHIPPUS noun- An extinct early Eocene mammal, Hyracotherium leporinum
 
More crossword clues leading to the same solutions
Here's a few more crossword clues - all leading to the identical solution