Is there a tail hole?

Yes, this chest carrier for dog has a tail hole on the bottom.

If the owner is an oversized people. Would the pack fit? How long is the waist strap for human?

The waist strap of the dog front carrier backpack is 55"/140 cm, and the minimum can be adjusted to 33.5"/85 cm.

Does the top strap bother their necks at all?

The neck design of our small dog backpack has lowered the point of force to the chest. Choose the right size, it won't bother your pet's neck.

Does this dog carrying bag have a tether?

Yes, this puppy backpack carrier has a safety tether.

Would it fit and be comfortable for a corgi?

Each dog is unique. We can't recommend size by breeds. Please kindly measure your dog before purchasing. If between sizes, please refer to the back length, or send us the measurements of your lovely dog.