Earlier quoted context omitted.
> Dogs think. This is certainly an assertion, given it's hard, bordering on impossible to to demonstrate that other humans think.
If your definition of "think" doesn't directly describe the cognitive processes that happen when humans process and react from the inputs they get, then what does the word mean to you? If you don't agree that humans think, then I think we just need another word. But that other word, applies to both humans and dogs and many other living things.
Philosophy is also not about what we think is true, but what statements we can defend. Solipsism is a notoriously difficult position to attack, even if we do not subscribe to it.