Hey Doug…yeah, you have a fair amount you can ditch/lighten up.
By the way, why doesn't the dog carry the kibble? CharlieDog carries his own (and my trash, as he eats his food) and anytime he needs a water carry (usually he just helps himself to streams). And he has really bad hips – he does just fine with the pack as long as it sits over his front shoulders and NOT on his back. The most he's every carried was food for 8 days – and he eats my leftovers (and those of everyone else in the group) as well as high-calorie treats to supplement. I also mix in puppy food to his normal kibble to add protein and calories. I hear you can get dehydrated food for dogs, too…. I hike with my dog all the time and my full pack weight for a summer weekend is around 10-12 pounds (depending on how fancy i want to get with my food).
Anyway – Mountain House meals, while horrible on the GI tract, can certainly take up a lot of space unless you repackage them. So before your trip, if you want to stick with MH (or any commercial dehydrated product for that matter – even Pack it gourmet) take the stuff out of its original packaging and put it in ziploc freezer bags. You can squeeze all the air out and roll it up to a really small package rather than that whole huge bag. It also helps with garbage collection on the way out.
First of all, ditch the nalgenes. Those things are SO heavy and huge – no need. Take a gatorade or smart water bottle and some water bladders for a water carry if you need to (i.e. for camp). then they can roll up and take up much less space and much less weight once you're done.
You'll get a lot of people who say there is no good place for a softshell in an UL backpacking kit, and as much as I really like to wear them around town I have to agree. They are way too heavy and way too bulky for what you get. Go for a light puffy or regular fleece depending on where you are hiking (i forgot…)
And really, really look at the dinky stuff in your first aid kit and in your toiletries, etc. Truly list out every little thing you have – lip balm .05 oz, toothpaste 1 oz, sunscreen 1 oz, etc etc. You'd be AMAZED at how much that stuff adds up and turns into very real weight. Be VERY critical about what you absolutely need vs what you THINK you need. Your first aid kit should be only about 1-2 oz, and add some vet wrap for the dog on top of that.
I can appreciate your love affair with the pack – but all I ask is that you keep an open mind as you lighten up. I felt the same way about my huge and heavy 8 pound gregory….but as the rest of my stuff got smaller and lighter i found that i ended up having similar love affairs with other packs, too. When you don't need to carry 50 pounds you find that lots of packs feel pretty darned light. And 4 pounds is an awful lot of pack for a lightweight gear list.
good luck!