Of course something is being done to the dog, it is being seen. You are taking things too literally. For something or someone to be the direct object of the verb it has to be the thing that the ACTION of the verb is directed at (directly).Originally Posted by paasikivi
It doens't mean the dog actually has to be touched in some way by the subject of the sentence.
What about in English?
You can't say - I saw he (nominative)
you say
I saw him (him is the accusative form of he).