Strange behaviour

Foxes badger hedgehog coming into garden . My dog was like this in our old garden so years he would into garden for a wee other yeaes nothing happening.

I'd go with the fox theory, especially if the cat is also avoiding your garden. Foxes can be so bold these days they face you (or your dog) out when they take a liking to your territory and then come across you in it!

A few years ago my small elderly cat became very frightened and avoided going near the French doors to the garden (where the cat flap was), wouldn't go outside and was just generally agitated. A few nights after this started I was sitting in the kitchen after dark and spotted a fox, standing right up at my French doors, looking in. It came around ffequently for a few weeks then stopped. The cat gradually calmed down with a bit of extra TLC and I closed the curtain on the French doors after dark.

Sounds like a fight or perhaps untoward advances were made!