because he havent ate since saturday and he hasnt had a drink in about 30 hours get some dyrolite mix it with water give it from barrel of needle for fluids,
when ever he eats mate he throws it back up
if it is parvo mate,its not just water it needs it needs that dyrolite mixed in with water to help replace its fluids its lost,if it frows it back up give it another few mill from syringe,all the best bud