Kelty makes one as well. I think it was called the Chuckwagon. When I was looking for a backpack for my Dane service dog, I came across a site that was just backpacking with Newfs. I'll see if I can find it.
Edited to add:Â Found the site
http://www.geocities.com/Heartland/Ranch/1011/newf-doggear.htmlOK! And the site isn't working, but I brought up the cached version, and they said:
"There are quite a few companies making them nowadays. When we started hiking there were only 2 or 3 available. We use Mountainsmith Dogpacks. Why? Because they seem to fit our larger dogs best and because of all the adjustments possible. Our dogs really change and grow for a long time. I love all the straps and adjustments possible on these packs. For some people they seem complicated. For smaller dogs they are way to cumbersome. These packs really can hold alot of gear. They are great for strapping gear on the outside, too. They are truly expedition style packs. If you are only going for an overnighter or the weekend, buy something smaller.
On the Mountainsmith packs there are 3 straps across the back. This helps keep the back cool in heat. The straps can be adjusted to fit the length and depth of their back. This is especially nice if you have a high withered dog or one with hard to fit shoulders. There is a chest strap to keep the pack from riding backward and for going downhill we sometimes tie that extra lead on the back ends of the bags and twice around the hindquarters to keep the pack from sliding forward. If the weight is distributed just right, this usually doesn't happen, though. You can also put a towel (dampened in hot weather)under those straps for comfort on older dogs. They seem to need the extra padding.
Other packs you can find out there are the Wenaha and the Wolfpack. I like the ability to remove just the bags from the Wenaha ( we make a similar pack ourselves) and I have heard good things about the fit and durabiltiy of the Wolfpacks. I have only used their smaller pack on a small dog. This is the pack I would use if I had a small or medium dog that wasn't going on any long expeditions. For a very complete list of dog packs available zip to this page
We have also made our packs in the past. This is a good idea for your young growing dog, before you know for sure what size he will require. We make 2 kinds- a harness with velcro and removable bags or a vest/jacket type ( a little like a Wolfpack)
A note about size- they sell packs by weight but some dogs are much shorter or fatter than others. Pay attention to the width of your dogs back as much as how far around he is. Be sure to try them on your dog over a towel or something to keep the pack clean and test for fit. You don't want to keep a pack that doesn't fit well. And don't use a pack that doesn't fit. You know what that feels like for a person. Well, it's even worse for your dog, what with all those elbows and legs. "
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Here's the Mountain Smith pack link
http://www.mountainsmith.com/store/?page=shop/flypage&product_id=185&category_id=8aa13962081f71d37d608ac2533e623dIt's really a good site for dog hiking in general.