This question is based on the idea that Slughorn's impersonation of an armchair in HBP might be a Transfiguration, as is listed in the HP wiki, and was also considered to be so in the highest rated answer to the recent Can you transfigure a human into an inanimate object?
In Slughorn's stint as an armchair, Dumbledore pokes him with a wand, causing Slughorn to yelp and then he 'appears' as a man with a watering eye (indicating pain felt). This seems to have a bit of a horrifying implication for the animal-to-object transformations, which the Hogwarts students do fairly regularly.
If Slughorn's transformation is a Transfiguration, does this mean (proper and complete) animal-to-object transformations leave the animal in question capable of feeling? Is a canary-turned-into-a-teacup able to still sense anything?
It's obviously still alive, since it can be turned back into the canary and we know there is no magic that can make dead things alive again, but while it's a teacup, can it feel hot tea being poured into/over it and people sipping from it etc?!
Aka. is there any indication of how concious an animal transfigured into a object is, in object form?