Dogs are no different to humans when they want something. The only difference is the way they do it.
Just so with humans the level of communication and intelligence depends largely on the dog’s background, how socially aware they are, if they trust you and how far they are willing to go with you.
I have four dogs, different breeds and ages, different backgrounds.
All are rescue dogs and all come with baggage in some form or another, whether it was abuse or neglect.
These dogs take time to win over (as would any human being who had been subjected to the lives they had endured) but ultimately trust has been gained, and distinct personalities have emerged.
The breeds are Papillon, (1) Staffordshire Bull Terriers, (2) and one Jack Russell.
The Jack Russell (10 yo) is by far the most intelligent and can communicate with her eyes, ie comes up to you, paws on your knees and looks straight into your eyes. “Do you want to go outside”? Yes! her eyes and body respond. She has not been socialised, (I have had her only six months) and she barks non stop when out on a walk at people, dogs, trees, rabbits, bicycles) it is kinda of embarrassing when people walk by and give that look, (what is wrong with that dog), we just keep walking.
The staffies communicate verbally by barking, (10 and 7 yo) (non stop until you listen to them) I want to come in, I want to go out, (a.m. pee time) I want my dinner, (always around 4 pm) I want to go for a walk, any time of day, but are most content snoring away nearby.
The Papillon is now getting on, (12 yo) he came from a terrible environment, hence is not friendly to the rest of society, except his home buddies and his priority is food and rest. His chosen friend in the family is the Jack Russell, distances himself from the staffies (both female).
These dogs, because of their deprived backgrounds, probably would communicate even more, but bad treatment in the past has made them overly cautious about people and unfamiliar environments.
They may not “speak” as humans do, but certainly their language and communication is obvious, be it food, walking, being warm or cool and wanting time with the person they love and trust.
No different to humans really.