The Mini - Set! (Wallace, the dog on the tetter is a large cocker)
For the tetter:
Buy a 12" by 6 foot board. Paint the board with sand paint.
Make the Base from PVC
I made mine about 8 " tall, but lower is fine.
Yellow indicates where
I put the elbows, and blue where the Tees were.
I made it wider than the board (the 15" pieces) and each base foot.
I then marked off a bit off from dead middle, and screwed in a 1"x2"x10" long piece. (With the 1" edge in contact with the board.)
I then put the base on it and Screwed in a second piece (1"x2" by 10" long) as tightas I could get it.
Mini dogwalk
I used 10" boards but I would 12".
Top board was 8' and ends were around 5'.
Bases are made the same as for the tetter, but make sure you place them all the way to the ends of the top board.
I attached the top board to the ends with door hinge.
A-frame
I took two 2' x 4' pieces of plywood and hinges them together with door hinges.
I attached 2- 2"x 2" x 16" pieces to the back to prevent warping. I put them about 3" in from the sides.
I put on slats, but I don't think it matters. I ripped 1" x 2" in half and used those.
I made sure to coat everything with 2 coats of good
exterior paint, then a top coat with sand.
I also made hooks and chains, just an eye screw on one side and a cup hook on the other.
Table
I used a 2' x 2' top. I then put 1"x2" square around it 2" end from the edge.
I then made a PVC base, and test fit it (I think it's 6" tall) Below is on side illustrated.
I didn't glue, as it is 
pretty tight anyway!