First of all, I assume you are referring to the animal a 'horse', as 'hourse's do not so far exist to mankind. I also assume you mean 'illness'. 'Ilness' is not a word.
Assuming that much, your question is unanswerable with the provided information. It depends on the illness, and the horse. I suggest having a vet check out the horse, so you can figure out what is wrong.
If the horse is Ill and not responding to treatments provided by the owner then you need to call a Horse vet immediately.
What is a hourse. What is spellcheck.
one
it is a pet ilness
disease .
she had a mental break down
government and ilness.
No.
What types of ilness is caused by phosphate?
She died of an ilness,
lung cancer
a person who is weak with ilness