Yes you can.
The dose for dogs of this product is 20mg/lb (or 44mg/kg) given twice daily.
The active ingredient is Guaifenesin which can be beneficial for dogs with upper respiratory issues.
Yes that's fine- it means 1200mg of Guaifenesin are in the product- so weigh your dog and work out the dosage-
so a 10lb dog would want 200mg (i'm guessing your dog will be around 40lb??) in which case it will be 800mg- so split the capsule and give 2/3rd of the contents.