That kind of unsymbolized thoughtform is fragile in my experience, as it strongly tends toward crystallizing into some kind of mental imagery. But I find it's possible in the right conditions to be conscious of chains of wordless, imageless propositional thoughts (by which I mean thoughts with truth values, of course, but also ones that are "propositional" in the sense of considering a plan of action or a causal chain).
Does it mean that dogs are evaluating truth conditions in the same manner but merely lack the linguistic components? I don't know; maybe that's wishful thinking. But they appear to have structured modeling/reasoning of causal and spatial relations in a way that's at least functionally equivalent to propositional thought.
1. That is, rather than just "images" or visualizations, the full spectrum of sensory/perceptual/motor emulations that can be experienced. See, for example, <https://hurlburt.faculty.unlv.edu/codebook.html>, though I'm not sure if this covers everything. I think there is, for example, a kinesthetic form of mental imagery -- which I would suggest is what coaches [don't know they] really mean when they tell you to visualize an action -- that consists of aborted motor commands that are still expressed just enough for their purpose (cf. the mostly aborted motor commands to the vocal cords, lips, etc. that can be observed in a person subvocalizing while reading).
Probably it's this linguistic component, together withs shared intentionality/cooperation, that makes all of the difference when it comes to the power of human cognition, so I wouldn't say animals merely lack this component, but it's true that they appear to have pretty much everything else we do.
They'll be laying down happily napping. Then they get up, walk to a different room, and some seconds later come back carrying a toy. They return to where they used to lay, lay down again, and put the toy on their front paws.
I don't know what else that was than the thought of wanting one of their favorite toys there for comfort. (Familiar-smelling things are comforting to dogs.)
wtf is with this nonsense where humans are some how special snowflakes always all the time
Sorry, what? You don't think you have thoughts?
Descartes will want a chat about that.