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Hello. Thanks for the question.
You really don't need to do anything tonight. You're not going to get rid of all of the worms immediately no matter what you do. When you go in, they'll do a fecal exam. This will tell them if there are round worms, hook worms, whip worms, coccidia or giardia. The fecal exam helps determine what to treat with.
You could go get an over the counter dewormer tonight, but it's not necessary. If you have an appointment, just go to that and start the meds at that point. Just be aware, it will cause more worms to be expelled after the dewormer. That is expected.
I hope this helps, let me know if you have any other questions.
You're very welcome. Take care!
Good deal, I'm glad he's being treated. The abdominal distension should go down over the next few days.