Welcome! I am Dr. Altman, a licensed veterinarian and I am happy to answer your questions.
Although the risk is low it is still a possibility to monitor for
Licking a slug will be more of an oral irritation. It may cause salivation or licking or both. For some that actually eat the slug, there may be nausea and / or diarrhea. With just licking a slug in its normal environment, I would just let him rinse out his mouth by drinking some water and then letting him rest. One source: "Some of these have indirect, and complex, life-cycles; several of them involve slugs or snails as intermediate hosts, where the habit of sniffing at slug trails, or even licking them, causes the parasite egg to enter the dog's respiratory tract."
The drug fenbendazole is usually administered to kill the parasite. It is very safe and does not harm the animal and a common anti parasitic used in pets as a broad spectrum dewormer
So it might be worthwhile to contact your veterinarian tomorrow as a precaution to treat with fenbendazole, typically one dose daily for three days
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