Here's an option that your brother might want to look into. Also price check different vets to get the best price. Puppies do really well with this too.
https://vcahospitals.com/know-your-pet/femoral-head-ostectomy-fho-in-dogs
his daughter (vet in training) mentioned something like that BUT their vet in TX claims socket/joint is to far gone for surgery to really help/make much difference.
I will forward the link on to him TY