Without her rent-a-guinea pig service, the owner would have to purchase a new, probably younger guinea pig as a companion to the ageing survivor, whose eventual death would force the purchase of yet another guinea pig, locking the owner into an endless cycle of guinea pig purchases in order to adhere to Swiss law -- even though he or she may only ever have wanted one guinea pig in the first place.
She takes 50 Swiss francs (€41) for a castrated male and 60 francs for a female, "as a deposit," Küng explains. In effect, she sells the animals but pays back half the purchase price when they are returned. The job of the leased rodents is to cheer up companions in their twilight years.
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