Hi
Cuys and related breeds are modern engineered larger meat guinea pigs bred for human consumption in South American countries and not as domestic pets. They have usually been outcrossed with wild guinea pig species, with which domestic cavia porcellus usually does not interbreed on their own. Our guinea pigs have been domesticated for at least 3000-6000 years and have genetic differences that can only have come about through human breeding.
This wild component in their genes makes them a lot more skittish and not ideal pets in combination with their size and greater strength/reach.
Sadly they have somehow got into the commercial shop breeding stock for chain stores, especially in California and increasingly other states.
Here in the UK cuys are thankfully still mainly confined to breeding cycles and have not (yet) made it into commercial shop breeding stock for the main chains, which is where the majority of piggies sold in this country orginates. They are however starting to turn up on free-ads.
We are keeping our fingers firmly crossed on that score, having seen what has happened with the poor skinnies once they got into the hands of scrupulous money making backyard breeders!
And all the satins still being sold to unsuspecting owners by Australian backyard breeders even though it has been proven beyond all doubt that osteodystophy (OD or 'satin disease') cannot be bred out and that it can appear generations later again.
There are of course always the idiots who want to buy or sell a pet with a difference without thinking about what they are doing sooner or later...
More information on cuys from this large rescue at the sharp edge here:
Cuy Page