Texas tooth from what?

[johnnyvaldez7.jv]

I found this tooth today...and my 1st thought was that it is an incisor from a horse. But I noticed that it is laterally compressed (flatter) compared to 2 other horse incisors that I've previously found and am including in the last photos  for comparison. It doesn't seem to be missing anything on the sides and has some enamel at the end which I'm not sure if its broken or not. There is a small hole at the crown side. 

I'm sure there's a horse expert here that can confirm it is one. I've included ruler photos as well as in my hand which was clearer. Just thought it was weird and different for a horse and was wondering if there was another choice mammal with an incisor this thin?

 

[garyc]

Maybe a peccary tooth?

[johnnyvaldez7.jv]

Such as a peccary lower canine? It's just too flat for me to consider it as a horse incisor based off of my previous 2 examples and and I've seen images of a peccary lower canine and this has some resemblance to it as a partial tooth...something about those lines that follow the curve.