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[Toy Story] How is a toy's level of sentience determined?

Context: Rex and Trixie are dinosaurs. But they can both talk normally. Slinky is a dog and can do the same, plus the fact in his stationary form his mouth is in a fixed state and cannot move, just like Woody/Buzz/Lotso/Other examples, but they can also talk just fine. Then there are other creatures that can't talk, such as Bullseye or the Pterodactyl from Sid's house. And Lenny (the Binoculars) doesn't even have a mouth but he can still talk! Whats that all about? Also the Phone on wheels has a mouth but can only talk when someone picks up the phone reciever, but Lotso's gang rub his mouth out for some reason.

Also, what qualifies as a toy? There are lots of different kids toys, ranging from Action figures to teddy bears to RC cars that make sense as being "toys" that could maybe be alive. But what about other toys that aren't humanoid or animal like? Etch is alive, but thats just an Etchasketch. WHat about Lego? Are each individual Lego alive? Or are they some kind of hivemind that lay dormant until they are built into a moveable structure? Can they build themselves? And then there is Hamm, a piggy bank is not a toy. Is it? I have a Jake the Dog mug, would that be alive as well even though its not a toy?

Another question. You have human toys such as Woody and Buzz who, when there is no one alive, can move normally, and thats fine, but then in cases like Barbie and Ken their movements are less smooth and more jerky (if you understand my meaning). Even though they have similar joints to Buzz and he move smoothly.

And how do non solid toys (Teddy bears and soft dollies and the like) hold themselves up, Woody has nothing supporting him yet he can stand upright, run around and even lift things heavier than himself, how does that work?

Not to mention you can splice toys together and make some kind of Frankenstein monster, how does the Barbie legs and fishing pole control itself? Is it two toys working in tandem? Or has one personality taken over and the other just ceased to exist? 

Any and all answers are welcome. These movies are very confusing when you start thinking about them.
gpt
I think that it has something to do with emotional investment in the toy and how a child plays with it. In play, children often give anthropomorphic characteristics to toys based on (even fictional) living creatures: Woody is a toy designed like a person, so Andy played with him like he was a person. The animals Slinky Dog, Hamm, Rex, etc., were probably imagined to have voices during playtime because it's not uncommon to see talking animals on TV, like in cartoons and things. And on the other hand, there's Etch. Etch comes to life because it was a beloved toy, but it's never been imagined as a living thing when it was being played with so it doesn't take on any anthropomorphic qualities.

As for the Legos, I'd think that the Lego people are definitely individuals but the blocks are not. The blocks are accessories secondary to the "living" Lego people, like Barbie and Ken's clothes.