I know exactly what you mean...
From the info I see, I would just sit in the "bushes/grass" w/ a bucket.
If you wanted to, you could do what Im in the process of doing... take an old pallet (you can git them for free at almoast any store or warehouse) and set it out there and make a frame for a curtain like covering (Im dye-ing an old bedsheet and making holes to place tall grass in it). And sit in the grass like that (on a 5 gallon bucket).
And fer yer dog, you want him/her to be out of the way as much as possible. Im sure y'll figger that one out
But its all really just a matter of scouting that area out, and gitting familiar w/ it. :salude: