I don't have a backpack for Maverick and don't think I'd ever consider getting him one because we aren't out hiking every week or anything.
The way I see a drawback about a backpack for a dog is the same way I think of it as a backpack for a human. You don't want to put too much to weigh down your dog and it also can't be good for your dog for extended use.
If you do consider a dog backpack, keep it light and keep the weight even. I'm also assuming you'll be using this backpack on hiking adventures and whatnot? If you're just using it for a stroll through the park or part of town, I wouldn't recommend it.
The way I see a drawback about a backpack for a dog is the same way I think of it as a backpack for a human. You don't want to put too much to weigh down your dog and it also can't be good for your dog for extended use.
If you do consider a dog backpack, keep it light and keep the weight even. I'm also assuming you'll be using this backpack on hiking adventures and whatnot? If you're just using it for a stroll through the park or part of town, I wouldn't recommend it.