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Do you know which mucinex it was? There is one for chest congestion, one for cough and chest congestion, and one for multi-symptom.
Or do you have the box with the list of ingredients?
Thank you so much.
That could cause some dizziness, vomiting, diarrhea, or lethargy.
Dogs can take guanifenesin.
And he is a larger dog so I would not expect anything serious.
If he does not eat for more than 24 hours, his gums turn pale, or he vomits and he can not keep water down for more than 12 hours then he should see a vet.
Give him a meal right now to help absorb some of the medication.
There is a also a possibility he will not have any signs at all since he is a larger boy.
Does that help? Do you have any other questions for me?