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My Wire Fox Terrier destroys the squeakers in her toys. By adding new squeakers I can extend the life of the toys, and keep the dog happy (it's all about the squeaker, you know.) I can also add squeakers to toys that don't have them, giving me a wider choice of what I can buy. I have ordered these squeakers several times in the past, and am very happy to be able to purchase large quantities of inexpensive squeakers.