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>it is also decreasing in mammals across the board in North America.

North America is a big place and there are a hell of a lot of different mammals in it. Are there really enough people out there taking regular and reliable measurements of testosterone levels in a wide variety of species over a wide geographic area such that we have a representative sample?

Ugh, it's probably climate change, or some PFAS chemical is wrecking everything.

Plastics in general leaching in to everything.

Specifically, domestic dogs are significantly affected, indicating they might be affected by the same condition as their owners.

You seem to be referring to "interspecies hormonal interactions between man and the domestic dog" [1] which is about short-term hormonal changes during "a dog agility competition" – not the long term hormonal changes which the opening post is about.

[1] https://www.sciencedirect.com/science/article/abs/pii/S00185...

I would very much so like to read up on this if you have the source.

source plz

Domesticated, wild, or both?