http://www.guineapigcages.com/forum/...re-treats.html
You should never give piggies any kind of commercial treat. The only treats they should get are the occasional very small piece of fruit (as per Ly's nutrition charts), no more often then 1x-2x a week.
You can also try giving them (at first, very small limited amounts) of fresh grass (no chemcials). You can gradually, slowly increase the amount of fresh grass you give them each day, so as not to upset their tummies.
Also on Ly's nutrition charts, you can find some examples of forages (weeds) that could be considered very tasty "treats" for
cavies. These should also be introduced slowly, and must be chemical-free (organic). Lots of piggies consider dandelion greens a delicacy (like piggy caviar xD), but don't give them too much of those too often, maybe 2x-3x a week, b/c dandelion greens' calcium to phosphorous ratio isn't great, too much calcium.
Guinea pigs can also eat the entire dandelion plant, roots and all. Just wash the roots really well b/c they had all that dirt on 'em. Also, don't take dandelions or any other forage from near the edge of a road, b/c the fumes from vehicles can actually be absorbed into the plants. I also heard somehwere that dandelions from garden areas taste better and have more nutrition than ones from the lawn...
Hope this helps!