Dogs (and cats) should not be eating grains or grain byproducts, their digestive systems are geared towards meat consumption.
Oats are likely wet milled in entirety and only a little fiber is strained out. Soybeans are processed by soaking seed, wet milling, cooking with water, then straining and pressing (if this liquid "milk" is treated to coagulate proteins the result is tofu). Both residues are largely cellulosic and could be fed to ruminants (animals with cellulose breakdown and digestion capability preformed by bacteria in there multiple stomachs). Or it could be composted and returned to the soil whence it came. Or put in methane digester to make natural gas for process heat in the "milk" processing facility.

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