Merck Manual

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General Concepts Regarding Fluid Needs in Dehydrated Horses

General Concepts Regarding Fluid Needs in Dehydrated Horses

Determining Factor

Formula Used

Amount for a 500-kg Horse

Fluid deficit

% dehydration × body weight (kg)

4%–10% × 500 = 20–50 L

Maintenance

50 mL/kg/24 hr

50 × 500 = 25 L/24 hr

Fluid losses

Estimate reflux or diarrhea volume

Rate of administration

50% in 1–2 hr; 50% throughout rest of day

20–35 L in first 1–2 hr; remainder distributed throughout next 23 hr

Adapted, with permission, from Zimmel DN, Management of pain and dehydration in horses with colic. In Current Therapy in Equine Medicine, 5, 2003, Robinson, NE, (ed), Elsevier.