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Of course they were interested. How often do dogs not notice smells like something cooking?
Many times my dog was interested as well, but either turned down when offered, or ate it.
No one says dogs can't eat or enjoy veggies, beans, lentils, or any other food. But they can not sustain on it. Whether containing all 9 aminos or not. Animals, or rather Carnivores are not designed that way, and you do more harm than good.
Also, science has proved that just because something provides all essential amino acids does not mean it is sufficient as there is a difference in animal and plant protein. There are good free articles on NCBI or National Library of Medicine on this topic.
I am not knocking a vegan diet per se, but it can not comprise of the complete diet. There must be some animal protein in there. There are enough studies out there now that show this to be true.
