I’m the kind of person that thinks if a dog is getting too fat on a food, decrease the amount given, and if its getting too thin, increase the amount given (with-in reason, of course). So yes, if you need to adjust, go for it. The guidelines on the bag aren’t set in stone, and all dogs digest foods differently, just like people do.
I mix water when I don’t have canned, and two of my dogs are 60 and 130 lbs. My old lab mix (the 60 pounder that doesn’t eat much) also doesn’t like straight dry food for very long. Once a week or so I’ll add canned food or some water to her dry food. Just enough to make it soft and water logged, but not swimming.
