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Hello. Thanks for the question.
Dicyclomine is actually used on occasion in dogs for colitis. We typically give 5-10 mg. This is higher than a dog would typically get, but still very safe. The most I would expect to see is some mild constipation. I would just make sure he's eating and drinking well. It should not cause any problems.
I hope this helps, let me know if you have any other questions.