That sounds like the one I have for Rain and Whisper. This one came from PetSmart and was supposed to support 300 lbs.
It's not all that sturdy. And I would never use it extended the full length.
Rain had her problem after jumping out of my Jeep Cherokee at a Pet Walk for the HSUS & thankfully she's recovered fully without surgery. But it was after that when I bought the ramp. She HATED it!
So I would place it between rooms in the doorway. You would have laughed to see
ME walking across it time, after time, after time! Telling My Girl "watch Mommy!" "Good Mommy!!!!" (Glad no one was watching.) After she mastered that I took her outside to watch me (yes me) walk up the ramp into the back of the Jeep. I think it was out of pitty for Her Person that she finally agreed to use it.
Whisper was ramp trained from day one.
Still to this day I park the vehicle backed up to a hill so they don't have that far to go and the ramp does not have to be extended fully. I'm fortunate to live in hilly country.
I really, really, really, hope Grace does not have to go through another surgery. Any time 'cutting' is involved there will be problems down the line. Fingers, toes, and paws are crossed that she won't need it.
"J"