Regardless of dry or tinned, you should go by calories. However many calories your dog maintains on with a dry food is going to be around what they need from a tinned food. There is no difference or benefit nutrition wise to dry food. So long as the tinned food you are feeding is labeled as “complete and balanced” you could feed all tinned if you like. The added moisture actually makes it a bit better than dry IMO
I imagine most large dog owners feed primarily dry food unless they have the proper funds for it, which is of course possible for some.
I personally feed my bigger dog 3/4 dry food and 1/4 “human food” like sardines, eggs, meat
