Our Lab Sofie, years ago had this surgery and it was difficult for her.
She was a Lab that loved her frisbee and loved to swim which is excellent
to rehab with vets approal.
Back then they had such a long list of "don'ts"
We had the sling
no steps so we built a ramp.
no running, no playing with Zachery.
went outside on leash only. She refused to potty on leash, it was funny but she was really stubborn about that.
Most restrictions were for 8 weeks...a lifetime to a dog that wants to play.
It was all worth it in the end, patience is key and following all the rules is what gets you your dog back the way he was.
By the next summer (1yr) she started playing frisbee again, soft tosses for weeks the increasing as we went along.
What really helped to rebuild her muscles was swimming.
Oh and one more thing...we had slippery floors so we went out and bought a whole bunch of rubber back throw rugs so she wouldn't slip and slide.
Good luck!
Sher