Second bubble lays back along side the first, same length, and is twisted in where the neck, front legs, and first body bubble all come together. Third bubble is back long side the other two, same length, and twisted. The third bubble is then rolled in between the first two to keep it in place and complete the body. I usually rotate the body so that two bubbles are on top and the third is toward the bottom of the legs. You will now know if you made the legs long enough.
Back legs are a repeat of the front.
I use a simple loop like the front, but experiment and see what you like. The balance of the balloon becomes the tail. This dog looks its best when the tail is kinda short. Like I said up front, proportions need to be practiced a bit. The keg is just a tulip with the end inserted in the top of the tulip to form a loop.