How I can select Monster by physic?
I know it:

Vec pos, dir;
ScreenToPosDir(Ms.pos(), pos, dir);
PhysHit phys_hit;
if(Physics.ray(pos,pos+dir*D.viewRange(),&phys_hit))
{
if(phys_hit.obj)
{
if(Horse *horseSel=CAST(Horse, phys_hit.obj))
{
//Horse is selected: do something
}
}
}

But it work only when I have first person camera. How I can Select Horse by physic (or other way) in third person camera (how I can disable Players Physic selection?)

I am not sure it will work but you can try .
for disable the Physics of your mesh.

Thanks Driklyn! It work.