Pet necklace

On the designs that take an upload, yes. A Choose File button appears on the product page - pick the photo before adding the item to the basket so it travels with the order.

A clear one taken at their eye level, with the face filling the frame and light on it. Photographs taken from above, which is how most pet pictures are taken, lose the face at this size.

No, though it is bought for that often. Paw and portrait pieces are worn just as much by people whose animal is asleep on the sofa.