How do you calculate maintenance fluid rate and factor dehydration and ongoing losses for a 5 kg dog?

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Multiple Choice

How do you calculate maintenance fluid rate and factor dehydration and ongoing losses for a 5 kg dog?

Focus on keeping the dog’s fluids balanced by three parts: maintenance, deficit from dehydration, and ongoing losses. For dogs, the baseline maintenance is about 60 mL/kg/day, which equals roughly 2.5 mL/kg/hour. For a 5 kg dog, that’s about 300 mL per day or ~12.5 mL per hour. If dehydration is present, add the deficit: percent dehydration times body weight (in kg), giving the deficit in mL to be restored over 24 hours. For example, 5% dehydration in a 5 kg dog is 0.05 × 5 = 0.25 L, i.e., 250 mL. Then add any ongoing losses, such as vomiting or diarrhea, also in mL/day. The total daily fluid requirement is maintenance + deficit + ongoing losses, and you convert that to an hourly rate by dividing by 24. Use a balanced crystalloid and monitor the patient clinically as you adjust. Example: maintenance 300 mL/day, dehydration deficit 250 mL, ongoing losses estimated at 100 mL/day → total 650 mL/day, about 27 mL/hour. This approach shows that maintenance is not as high as 100 or 200 mL/kg/day, and dehydration and losses are added on top to reach the needed rate.

Focus on keeping the dog’s fluids balanced by three parts: maintenance, deficit from dehydration, and ongoing losses. For dogs, the baseline maintenance is about 60 mL/kg/day, which equals roughly 2.5 mL/kg/hour. For a 5 kg dog, that’s about 300 mL per day or ~12.5 mL per hour.

If dehydration is present, add the deficit: percent dehydration times body weight (in kg), giving the deficit in mL to be restored over 24 hours. For example, 5% dehydration in a 5 kg dog is 0.05 × 5 = 0.25 L, i.e., 250 mL. Then add any ongoing losses, such as vomiting or diarrhea, also in mL/day. The total daily fluid requirement is maintenance + deficit + ongoing losses, and you convert that to an hourly rate by dividing by 24. Use a balanced crystalloid and monitor the patient clinically as you adjust.

Example: maintenance 300 mL/day, dehydration deficit 250 mL, ongoing losses estimated at 100 mL/day → total 650 mL/day, about 27 mL/hour. This approach shows that maintenance is not as high as 100 or 200 mL/kg/day, and dehydration and losses are added on top to reach the needed rate.

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