
MY dog has elbow displasia, to start with he only had very short walks but that's becasue he was lame as a puppy, now he has been built up to longer walks, making them shorter would actually make him worse - UNLESS he is in pain.
All I can think of is maybe your friends dog is doing too much in one go for the state of her hips and perhaps she'd be better off having that walk split into 2 smallar walks eg. her current distance split in 2. The limp may be just a blip, for which 2 shorter walks will aid joint mobility while taking a little pressure off while she's sore (my dog gets the occasional limp that may/may not require a temporary change in excersie).
It really depends on how bad the dogs limp is, if it is extreme then 2 x 5 min walks per day may be what is needed for now, untill she can be built back up again.
As for diet, it doesn't matter WHAT the dog is fed on as long as it is kept lean. Good suppliments are cod liver oil and glucosamine
(go for the HCL not sulphate as it's better acting)
.
Not playing with other dogs may be a temporary suggestion.
The vets advice does seem OTT but we have not seen how badly effected the dog is.
When my dog has a very bad limp, I don't need the vet to tell me to cut his walks down and stop him from playing with other dogs/climbing on/off furniture. I'd rather make him take it easy for a few days/week than allow him to damage himself so badly thats is game over for him.
I have not have him opperated on and will not do so, but this does mean management has to be tailored to the dog and adjusted according to thier current state - if they are suffering = change what needs to be changed in order to help them, if that means taking things a little easier for a few days then that is what should be done.