I would have your vet do a full exam on him to make sure he doesn't have any injuries that can't be seen. Sometimes restaint can make them sore so thats one reason. Another is many times, the groomer will pluck hair from the ears and make them sensitive so that could be another reason. Have your vet check him, and you may be able to get the groomer to compensate you for the vet bill if your vet can state what it resulted from.
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Let me know if you have any other questions
Good Luck &
Best Fishes
