A dog can drink ditch water you can see the squigly vermin in with no ill effects. If you do it you’ll likely be sorry.
It has to do with their elevated body temperature of 103 degress, IIRC.
Dogs don’t tend to be affected much by microorganisms, but I’d think if there were any sort of chemicals or dissolved metals in the water, it would cause problems. Of course, you probably wouldn’t see it for a very long time, and I don’t know what sort of metals are used in a dehumidifier anyway.
Per Wikipedia:
“Generally, dehumidifier water is considered a rather clean kind of greywater: not suitable for drinking, but acceptable for watering plants, though not garden vegetables. The health concerns are:
-the water may contain trace metals from solder and other metallic parts, most significantly lead (which is quite dangerous), but also copper, aluminum, and zinc. The trace metals pose a danger if used on edible plants, as they can bioaccumulate; however, the water is usable for irrigation of non-edible plants.
-various pathogens, including fungal spores, may accumulate in the water particularly due to its stagnancy; unlike in distilled water production, the water is not boiled, which would kill pathogens (including bacteria);
-as with distilled water, minerals are largely absent, hence it is somewhat flat-tasting.
Food-grade dehumidifiers, also called atmospheric water generators, are designed to avoid toxic metal contamination and to keep all water contact surfaces scrupulously clean. The devices are primarily intended to produce pure water, and their dehumidification effect is viewed as secondary to their operation.”