How long have you had him?
Stress from a new environment (or shipping) can cause the wobbling to be more intense, or even excitement at feeding time.
How does he behave "normally" since he's been with you?
If he's pretty new, let him have time to settle in with you longer and let him get used to his new home, and it should tone down. It's possible that he DIDN'T behave that way for his breeder, and the new home adjustments brought it out.
Have you contacted the seller with your concerns?
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