Instruction: Evaluate the answerability of a question by analyzing the related document, outputting yes if the document contains information addressing the question, and no otherwise.

Input:
Question: How much fleece covers the inside? Meaning, is it still usable in the summer time?
Document: It still runs a little large, on a medium 40lb dog. But beyond a doubt, the durability and strength of this pack comes from it's great, durable fabric. The fleece lining led to no rubbing or chafing on the dog and could easily be used to pack 3-4 days of food for your dog.
I purchased this pack for my 63 lb Husky, and it fits very well. While he doesn't particularly enjoy carrying his own gear, he is still able to retain his normal range of motion. Even on rough trails, steep grades, rock slides, and narrow cliff-side paths, my dog was fine with his pack. It dries quickly, and seems to be water resistant, as the gear inside stayed dry after fording several creeks.
Just bought and used. First backpacking trip for our doggy (7-year-old, 75lb lab). Doggy adjusted immediately, although still a bit skittish when rubbing unknowingly against a boulder or tree. Very roomy, even with four days' food, water bowl, harness, leash, and drying towel we could have stuffed more. Although not wholly submerged, the bottoms of the bags were in deep when Doggy bounded into the lake for a drink, the articles inside remained dry - yippee!
I put a couple of my weights in each pack and instead of being in prey mode she is now focused on what she is carrying. We are no longer being dragged along and our daily walks are much more enjoyable. We have no problem getting it on her other than the time it takes to fasten 3 clasps and we're getting better at it each day.This back pack is made out of canvas and very well constructed.
Also, walking with the pack changes the position that the dog has to walk beside you if you walk him on heel - he has to learn to move a couple of inches left so the pack doesn't run into your leg. If you let your dog walk ahead of you or mumble around I guess this won't matter much, but for us from the time we leave to when we get back I use a Martingale and correct him to get him where I want him to be.
It has room for a dog's hiking essentials: A few water bottles, leash, a foldable feed/water bag, etc.It looks a little bulky on this guy (not too much), but again, back to the size preference. And while Xae usually loves sprinting between me and the rest of my family on the trail, he does not like to run while carrying his pack. Next time I will remove the felt sheaths from the straps and hopefully a more secure load will encourage him.
He stays very still to put it on and at his size only needs a medium, the straps have plenty of room to spare and only a really large dog (100+) would need a large. Even with a compliant dog putting it on takes getting used to - but becomes easier with time and the realization by the dog that a fun activity is soon to come. Highly recommended.+
If we are a little slow, we are gonna hear some complaints. She can yap for a long time.Our dog has a 31&#34; bust, not very tall but stocky. And small size pack fits her perfectly. There is still some strap hanging loose and we just let them be. When the pack is well adjusted and the weight is balanced, the pack stays on pretty solid for a whole 10-mile trip.
I really like how big the side bags are for this bag and that each bag can be tightened. My big problem, which it sounds like many people have, are the bottom straps. If he ever runs with the bag on, those straps come loose, super loose. This caused chaffing in the under arms for my pup. I would've returned but didn't do so in time. We still use and I just have to check the straps often and readjust.
I have a male Black Lab and Cattle dog mix. He is exhausting. Two hour long walks and a few hours of fetch and dog play a day wasn't even making a dent in his energy. I read a book on dog training and it recommended getting a backpack. After looking through several options I chose this one. It is great! We still take long walks and have play time but by the end of the day my lab is dragging.
Answer: no