That's a good deal !INDEED and it's nice of you to add what you can to what he charges.
The hip issue is very common for German Shepherds with the slanted back. Kaia has a straight back, like all her siblings from that breeder, and they're all hip tested. So, the risks are much lower, although not zero. In this case, I am worried it's the knee Cruciate Ligaments, because she's probably too old for a major surgery, like the one she had a few years ago. We'll see what the vet says, hopefully it's just arthritis.
Have a great day, !ALIVE
!WINE