I have been curious that verb 'walk' means 'causative verb' in 'I walked the dog.' sentence. And I know these verbs (have, let, make) are causative verb, but how verb 'walk' in 'I walked the dog.' sentence means 'causative verb' without these verbs (have, let, make)? And what is difference in both?
To "walk the dog" means to control and handle the dog while it performs bodily functions. That is, make sure it's pee and poop go in acceptable places, stoop-and-scoop after if required, keep the dog from going places that dogs are not permitted, return the dog when these functions are complete, and so forth.
By extension, "walk the dog" can mean a human going to use the toilet.
To "make the dog walk" would be to do something that produces a dog that is walking. It does not necessarily involve all that other stuff in the first phrase.