If you can see a horse's ribs and its back bone is it under weight?
No, it's emaciated, not just underweight, a horse that looks like this either has some serious health problems or is being neglected
Then it is time to call the the local animal shelter etc.that handles animal abuse...Poor thing is sick or neglected and needs some sort of assistance...
Either it won't eat or it's being neglected and not being given proper nutrition. So either you need to get it checked by a doctor or give it to a more suited owner.
The horse is beyond underweight, it is being starved
Yessssssssssss!!! U need to feed the horse right away! That things starving!!
Call an animal hospital! And for one thing it is emisiated! :(
No it means its sick get a farm vet