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If you are hiking with a dog, check the park website to be sure that your desired route and any side trips you plan don't have restrictions for dogs.
Osprey packs are fairly adjustable for torso length and some of the waistbands can be heat molded at an REI store for better fit. Before buying a new pack I'd look into whether your current pack can be properly fitted to your body shape.
And as the portion of the Appalachian Trail that runs through the park crosses the road so often you may be able to work out some resupply caches or even a vehicle shuttle if you have a companion and two vehicles. Either option would cut down on the weight you'd need to tote.
Be sure to go to the NPS website and review the backcountry rules and camping policies as you will need to have you itinerary set before getting your camping permit. If you don't want to deal with the hassle the Washington and Jefferson National Forest has many miles of the AT and other trails without the bureaucracy....or the crowds.