Obtaining a proper pack is the first step. It is possible to construct a pack yourself with the right pattern, but the best bet for most beginning dogpackers is to purchase one of the commercially available models. Links to some commercial dogpack suppliers are provided at the end of this article. The important considerations for pack selection are 1) correct fit and 2) intended use.
Correct pack fit not only ensures that your dog avoids abrasions or muscle sprains, it also keeps the packing experience enjoyable. Imagine walking a mile in shoes that are too tight or too loose: while it may not injure your feet, it certainly won’t be fun! Pack makers generally size their products based on the weight of the dog and the circumference of their girth, measured around the entire dog just behind the elbows. Common sense on the owner’s part is also necessary. A Welsh Corgi may be too short to wear the same pack as an equally-girthed taller dog, for instance.
Intended use is an important consideration. The needs of an owner who wants a dog to carry leashes and bowls for a trip to the beach does not need the same durability, volume, and ruggedness that a wilderness backpacker requires. Two factors will help you decide on a pack:
Volume.
How much do you need to carry? Dog packs, like human backpacks, are
often sized in terms of cubic inches. For hauling a few items on a day
trip, 650 cubic inches (roughly 13"x6.5"x4.5") is probably sufficient.
For a multi-day backpacking excursion, look for packs with volumes of
2000+ cubic inches. Of course, don’t buy a pack that is too large for
your dog to carry!
Durability.
A pack that will only see service for in-town jaunts does not need
to be as heavy-duty as models intended for wilderness hiking. If you
plan to take your dog on backcountry adventures, look for packs made
from heavy-duty Cordura nylon. A pack that splits open halfway through
the trip could be a nightmare. Remember, dogs are not gentle on packs.