I have a way to get rid of wandering jew..... chickens!!! Ours have eradicated it from our yard.... do you know anyone with chickens who will lend you them for a few weeks? They will dig up the roots and get rid of it.

The ear infections are another symptom of allergies.... mainly the contact sort

ETA: I forgot to add, humidity makes it all worse. Especially the ears. Skin issues which cause a moist like symptom on the skin, can become yeast infections very quickly.... most ear infections are yeast based. If you get something called 'Malaseb; it is a shampoo with the chlorhexidine in it. If you dilute it 1:40 you can use it as an ear wash to help kill that yeast in the ears and you can use it in the bath for his feet as well! We used it on our lab and for ears to prevent ear infections.

HTH!