If you undertake an internet search for
concrete and horse urine you will find many ‘experts’ claiming that special
concrete needs to be used in stable floors to protect the concrete from being
attacked by horse urine. Horse urine is actually alkaline, does not
cause concrete to deteriorate and is no more damaging to concrete than urine from
any other domesticated animal.

What does cause wear to concrete floors in
stables and yards is the metal horse shoes.