How do I save my Holly Plant?

2yrs ago I bought 2 small Holly plants at the end of the summer season. The next Spring it seemed that rabbits had eaten nearly every new limb on it. While the leaves did come back its been 2 more yrs and still its only 5-6in tall and doesn't look like its ever going to actually grow into its glory. Is there a trick I'm unaware of to salvage it? I hate pulling plants that actually have green left to them ..

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