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You could also just use metal thumb tacks or a nail. Place them at the correct spots by making some sort of stencil on a large sheet of construction paper. That would give it a sort of 'floating' look, which would be cool. Also, you could paint those thumbtacks the color of your wall or even an accent color (when you take off one of the jars, you see a cute little splash of an accent color). I've been thinking about doing something like this for a while now :)
Great hacks in general, but make sure you don't teach the dog leash one to small kids with big dogs. When I was little I once tied my 2 year old lab's leash around my wrist tight and we walked to the lake. She was so excited that she dragged me across the rough asphalt of the boat ramp all the way to the water. That wasn't super fun for me, but this hack would definitely work with smaller or old dogs, and would be nice when you get to the park and want to tie the dog to a pole or a bench.