I thought this was pretty interesting. It's a comparison of water, chicken flavored Gatorade, and subcutaneous fluid and how they affect the dogs.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5662554/


If I understand the result correctly, hydration strategy did not affect the work. The dogs liked the flavored electrolyte solution best, and none of the hydration strategies had a bad effect.https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5662554/ wrote:Searching behaviors were independent of hydration strategy but highly related to the dog specific factors of sex, breed, and activity level. Under conditions of controlled activity in moderate heat and humidity, dogs accustomed to the work and the environment were more likely to increase fluid consumption and hydration when provided a flavored OES. Potential benefits of OES and SQ were indirect and no adverse effects were documented for any of the hydration strategies tested.
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