Moropus elatus
The animal in question is Moropus elatus.
It was an odd-toed ungulate (the order Perissodactyla). It was related to horses, rhinos, and tapirs.
But unlike those animals, Moropus had claws:
Moropus was part of a family of odd-toed ungulates called Chalicotheres (“gravel beasts”).
They could use their claws to grab foliage and bring it closer to their mouths.
Morupus did not have the most extreme feet in its family.
Some members actually walked on their knuckles in a very gorilla-like manner.
They could use these specialized hands to grab branches in a very similar fashion to the way pandas grip bamboo.
Why do you call this creature a “horse”? it has some similar skeletal features– but then, equally as many could be termed “dog-like”. Or ….