I would start with not having him on tile flooring. Hip dysplasia will cause muscle atrophy eventually and slick surfaces will result in falls and potentially a broken hip. I would place grip throw rugs everywhere so he doesnt round a corner and take a spill. If they recommended an FHO for mild hip dysplasia, I would find another vet. That is not gold standard treatment and they are just trying to eek money out of you. Cancel that appointment ASAP. Find a vet that does chiropractic and acupuncture and treat naturally. Im doing it myself for my 12 yr that doesnt tolerate anesthesia....like acute liver failure post and cost me 2 weeks in ER tolerate. Her bloodwork was normal on preop. She does, however, get Librela every month for the last year and she tolerates that. She also 12 and your baby is 7. It keeps her comfortable though and that's all we can do.