jdd

It all depends on the dog but you really don't need to feed that much canned. Mine get a table spoon or two just for flavor.
I look at my dogs each day before putting food in their bowls. They are given about the same amount every day but if they look like they've gained I give them less if they look lean I give them more. Alex eats about 4 cups a day, he weighs about 80 lbs. Holli eats 3 to 4 cups a day depending on how much running she did that day and how she looks. I got a new male in to show who needed weight, he's VERY active. I've put weight on him feeding 4 cups twice a day but now that he's where I want him I'll cut him back. The great eaters I use very little canned, the not as great eaters might get a little more but never a whole can in one day.
I'd just feed the amount of dry you normally do, look at him each day and give more or less accordingly.