Because you can keep garden snails as pets. Well, I'm not sure if they're garden snails, but I found them in the garden.

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for-gondor | tumblr
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Dogs: Willow [Irish Setter] + Poppy [Lhasa Apso]
Cats: Paddy + Oscar
Gerbils: Bean, Mable, Graeme, Frankie, Bill, Baby Mable + Lupin