Four Seasons Wormer
I honestly don't know if it works!
I have my fingers crossed that it is working but I shall never really know because I feed and medicate the urban foxes that come to my garden. This area, until 70 years ago, was all fields and given over to farming. Much of that land exists today but the farms have long since gone. Houses were built after the second world war and slowly the foxes lost their habitat and along with it, their food. They are now starving and forced to scavenge from takeaways and people's gardens. I feed them, medicate them for mange and continue to put food out for them until they decide to move on. I then care for the next lot. I am only above to monitor them by a wildlife camera so I can pick out those who look emaciated or suffering from mange, limps etc. Obviously, I don't interfere with them otherwise.