Answer: It would be unusual for deer to feed on the flower buds of one tree and not bother a similar tree 10' away. So, I wonder if your lilac is not quite old enough to bloom. Size is no indication of maturity in the tree world so even if your lilacs are the same size, there could be a few years difference in age. With all other things being equal, I think your lilac is not quite mature enough to flower. Watch it over the summer months to see if it actually develops flower buds. If so, it should bloom for you next year. Hope so!
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