I don't know if the rust problem is as bad out west as it is here but, my welded wire fence started popping welds real bad after 3 years, some were popping loose in 2 years.
Good Luck with your Fox!
Scott
here in the desert rust is not too bad on metal; the chicken wire rusted because it was on moist earth as there is a garden bed along that side of the pen (it was there for about 6 years or more) . We may go 4 months without a drop of rain and have 10-15% humidity most of the year unless a rain storm is imminent. There is wood and metal out here over 100 yrs old and just now getting rusted enough to be holey