Formula & sources
Measured water disappearance = starting water + added water − remaining water − spills − discarded water. Use the same start and end times for every measurement. A short record is not extrapolated to 24 hours. Shared bowls, evaporation and unmeasured water sources reduce accuracy.
- PetMD: How Much Water Should a Dog Drink?Context for observing drinking; the balance equation uses your measurements.
- NIST: SI Appendix B.8 Conversion FactorsUS volume conversions.
Reference values & examples
- Observation example
- 24 hours
- Starting water example
- 1,200 mL
- Top-up example
- 300 mL
- Remaining water example
- 400 mL
- Spill example
- 100 mL
Start with 1,200 mL, add 300 mL, leave 400 mL and spill 100 mL: 1,000 mL disappears during the measured period. Only a complete single-dog measurement can approximate that dog’s drinking.
Common questions
How do I measure water during one observation?
Measure starting water, each refill, remaining water and losses over the same period. If one dog uses several bowls, add their starting amounts together, then do the same for refills, remaining water and losses. Keep water available throughout.
Can a shared bowl measure one dog’s drinking?
No. Select shared or incomplete when other pets, unmeasured sources or losses affect the observation. The result measures disappearance over that period.
Can I turn a short observation into a daily total?
No. The hourly average covers the hours you recorded; do not multiply it to predict a full day. Compare records taken over similar periods and conditions.