Advice Needed! How discourage a vixen fox

[BlueKota]

from coming into my yard. My dog has alerted me several times that she is in his fenced in play area. She jumps the fence. Last night she was at the bottom of the deck stairs. I don't feed the dog out there, but I know the birds drop bird seed in there. Do they eat seeds? There is a squirrel that comes around occasionally but it's out in the daytime.

I appreciate nature and don't want to harm the fox just don't want her coming near the house or in Dakota's play area as one of our previous dog got a case of mange from rolling in fox poop on a walk.

Any suggestions. I blow a whistle when I see her in the pen. She takes off, but comes back the next night.