Unfortunately ear mite tend to multiply when other issues, like stress, are challenging the immune system. I don't like the looks of the sores on the back of the neck, I hope they're not bites. Do you know for sure the baby is a boy?
And almost any pesticide-free, clean grass will do, but if you want hay, just find someone with horses. Native diets vary from country to country, eg: a lot of Asian areas will use sweet potato vines as a staple. But any variety of vegetation is fine too.
A little pile of tree branches might be nice, tho not sure what you have there. I use fruit tree branches from fruit that doesn't have a pit, eg: apple and pear. Willow and birch are also good in this area. Just in case, I leave the leafs intact but I'll throw them in the oven on low for a few hours to dry up any sap and kill any bacteria, although either are rarely an issue.
Thanks for helping these guys.
sas :clover: