I think you should not give your dog maalox.
You would need to ask your vet about it and if it was okay you would need them to tell you the dosage and other important things. The number one cause of poisoning in our pets is medication, often given by well meaning owners without knowing what they are doing. Over the counter and/or okay for us does not mean it's not deadly for them. Call them.
www.petplace.com
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www.merckvetmanual.com
www.petplace.com
vetmedicine.about.com
www.merckvetmanual.com