What is the exact dose for my cow?

I cannot give an exact ceftiofur dose for your cow. Prescription antibiotic doses must be set by a veterinarian after checking the animal, because the wrong dose can fail treatment or leave milk residue. For now, keep the cow clean, give plenty of water, and isolate her if she has fever, cough, mastitis, or a wound. If she is off feed, has high fever, or the udder is hot and painful, get a vet to examine her today. Treating this early is far cheaper than losing milk for several days. Consult a veterinarian before administering any medicine or treatment.