If not, you should. B complex is vital for helping any ailing animal get back on its feet. It aids in rehydration when used with subcutaneous fluids, it stimulates appetite, and the fortified formulation contains vital, potentially life-saving levels of thiamine.
Being water soluable, the margin of error is wide, and excess amounts are excreted through urine. It can be given orally, subcutanously, or into the muscle.