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What you describe is not a side effect of gabapentin. They contraindicate its use in dogs that have kidney deficits, but the only side effects are vomiting, depression, excessive sleepiness and loss of balance. None of the other medications should cause otic issues either, especially since he's not new to taking them.
Gabapentin is a human drug and is not FDA approved for use in dogs. This means your vet is bound to try traditional pain relievers that are licensed for dogs first, and if they fail to be effective then the vet can justify the use of gabapentin.