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Hello. Sorry for the wait.
You can use Robitussin DM. This has a mucolytic and a cough suppressant in it.
The dose is fairly wide and safe:
Small dog- 1/4 teaspoon
Medium sized dog- 1/2 teaspoon
Large dog- 1 teaspoon
It can be given every 8-12 hours.
I hope this helps. Let me know if you have any other questions.