Further to Stardust's excellent research, Annie:

"they despise adult MALE URINE as in Rogers ... as well as vinegar , chilli and garlic powder."

I suggest the following:

1) make some very strong chilli and garlic pickle;

2) feed said pickle to Roger (perhaps as part of a 'modern ploughman's lunch' in keeping with the rural surroundings;

3) induce copious micturition - my recommendation here, again following the rural vibe and Roald Dahl-inspired Grumpy Men v. Sly Foxes theme, would be flagons of farmhouse cider;

4) send Roger down to the end of the garden to spray your foxy cares away with his 'deterrent applicator'.

You may find he acquires a taste for the pickle and cider combo, in which case you have a long-term solution guaranteed.

Good luck!