True that occasionally pets sold on adoption are from pets at home as they have become to old, but this is stated on the adoption notice. Other animals are those brought in by members of the public who can no longer look after them.
Obviously breeding is not going to be the same as having pets at home, but I just wanted to make clear that the animals at pets at home have the best start possible for an animal store, this was the aim when pets at home was first established. It is true that some of the animals may contract health problems, but normally if pets at home hear this they contact the supplier to let them know, standard policy.