How moldy is TOO moldy? I do NOT give hay that even has the slightest hint of smelling moldy to my horses OR dairy goats, & was told that slightly moldy hay was okay for sheep so was letting them have some that I could smell mold but I picked off the parts that I could see mold- one day we were in a hurry & just tossed the hay to the sheep without picking the mold out (each flake had about as much mold as I could fit my opened, fingers outstretched hand over) & we came home to a sick, dying sheep. Only one died, which was the only one not vaccinated for CDT, but ever since then we don't let the sheep eat any moldy hay.