So here asking the age old question about joint supplements.  Looking at the experiential feedback in addition to whatever evolving knowledge base there is.  Seems much of what I found was for joints mixed with cancer experience and I'm only worried about the joints so specifying topic to that area.

As many of you know -- Ginger is a 2.5 year old German Shepherd, no cancer but accident caused tripawd. As a GSD and missing a front leg I am well aware that she is at a pretty big risk for joint problems as she ages.  I read the nutrition and supplement blog and have heard input from vets, owners of big dogs and different local sources, in addition to google which now has me a bit confused and conflicted because on all the following stances I can find a million arguments for vs. a million arguments against courtesy of the internet.  So options as I see them thus far to go ahead and start giving her joints a little extra oomph as she hops along.  Another case of too much information not always being a good thing.

Fish Oil -- of course some sources say it's great, others say it is bad for cholesterol that as an animal product, while it may be great for the joints it puts other areas at risk.  

Glucosamine/Chondroitin - research voices a lot of good but also raises comments about risk to their blood sugar, any seafood allergies, etc...especially if you pick substandard brands

Flaxseed oil - a friend swears by this that she has given to her two extra large breed dogs - newfoundlands or something like that and says because of this at the age of 12 the vet still brags on the health of their joints and how they are not suffering with the many joint issues that tend to plague dogs at their age.  downside is a lot of what I read online says this is not likely to be converted well by dogs so therefore they may not get the best results.  I like this option the best but am hesitant to go this route based solely on the sales pitch of one friend.

Any ideas or personal recommendations of what's worked for you?