Any girls with a big butt have trouble with doggy style?

This girl that I'm seeing atm has a really banging body and she trains a lot at the gym... she must do squats because her ass sits up and pushes outwards... i love her ass but problem is i can't seem to make doggy style work with her? how can i make it work? every time we try i fall out of her... and I'm doing all the same angles etc as i normally would ARGH, do any girls out there with a big butt also have trouble with this?
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thanks everyone, i think
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