[vidarh]

> Everything I see in dogs suggests that they are sentient, they just don’t seem to need language. They speak when it is useful, like for getting attention from people in different rooms, but they don’t really need it beyond that. So they don’t go any further.

If you haven't check out whataboutbunny [1] on Instagram to get an indication of how far dogs can go when given an opportunity. Bunny is trained to use buttons to "speak". A lot of it is very simple and functional ("outside", "play") that could easily be handled by body language and the odd bark, but occasionally you get fairly complex conversations which seems to indicate introspection and fairly complex reasoning that as you say they "just don't seem to need" to be able to express in language in normal conditions.

[1] https://www.instagram.com/whataboutbunny/