I know what you mean, but for me the joy they give you for the duration of their lives, far outweighs the sadness you feel when they're gone. And you'll always have the happy memories, and hopefully some nice pictures to remind you of that :)
You can't go through life shielding yourself from grief, at the expense of experiencing affection and love, with animals or people, as that will ultimately lead to sadness and a sense of non-fulfilment.
Marco.

