No, foxes do not belong to the phylum Arthropoda.
Here is why:
Arthropoda is a phylum of animals that have exoskeletons, segmented bodies, and jointed appendages. Examples include insects, spiders, crabs, and lobsters.
Foxes are mammals, which belong to the phylum Chordata. Chordates have a backbone, a notochord, and other shared characteristics.
So, while both foxes and arthropods are animals, they are very different in their biological classification.