Translation:Can dogs dream?
because the sentence is too general. will [all] dogs in general dream [when]? is a strange thing to ask. a question of the capabilities of dogs is more likely.
if you wanted 会 to mean "will" you might have to be, like, 我的狗明天晚上会晚不会做梦? or something like that. specific dog (mine, specific event, will this come to pass?