Hi, So my family is going on vacation and we love to hike--long hikes. I am trying to figure out what Beau can/should be able to handle and how best to equip/take him. Usually I have boarded him but given the recent outbreak of kennel cough at the facility we like I decided to take him and luckily the Air BnB we rented has a dog run plus lots and lots of outdoor space. So advice, I can use all the helpful info I can get? Can he carry a backpack with a small water bottle? He has worn one before--and he is a big, muscular sheltie (19+ " and about 35 lbs--sheer muscle). Should I have something like a cooling vest?