Fanaelialae
Legend
I don't think that many people (anyone?) have been suggesting that the elves and dwarves in the PHB are particularly nonhuman. We've been saying that we like to modify them to make them nonhuman.Given I've seen people in related discussions largely suggest that even fantasy nonhumans should have extremely alien mindsets, I'm afraid I don't think context helps you much here.
I think there's a big gap between "has some traits based on having different senses or cultural differences" and "has radically different biology in multiple important ways", so no, I can't agree with your premise in this paragraph. Most nonhumans in fantasy are humanoids with not radically different diets or environmental tolerances or general social structures. There's quite a bit of difference between that and what you'd expect from a dog, even one with human levels of intelligence.
Here's one from one of my actual campaigns, for example. The actual write up is fairly long, but I'll try to summarize it as best I can.
I changed elves so that they were (literally) the seeds of enormous world trees. The world trees basically ate some humanoids and used them as a template to create mobile seeds. Many of these elves were cautious. Rather than embracing YOLO, they perceived their humanoid form as a sort of pre-life. They were still waiting to be truly born. They were carnivorous, because the world trees become one with local vegetation (they literally are the forest) and to most elves being served veggies was akin to their mother's finger on a plate. They were also asexual, technically capable of reproducing sexually, but finding the idea of it disgusting. They saw themselves as having more in common with plants than animals, and looked forward to the day when they could (literally) set down roots. However, some did set out into the world, because if they remained near their parent, they would simply become one with their parent tree. If they wanted to become a true world tree, they needed to find their own lands to set roots in (and, hopefully, also protectors for when this time came). While there were elves in the world that ate their veggies and had sex, they were quite atypical for elves.
If what is considered typical for humans is atypical for these elves (specifically with regard to the species as a whole, rather than individual cultures), then I think that clearly demonstrates a nonhuman mindset. Even if an atypical member of that species might resemble a typical human mindset.
Regardless, I don't see a significant likelihood of this line of discussion going anywhere useful, so I will probably not respond further regarding this topic.