I am not really sure what all the benefits of colloidal gold might be regarding pets. In people it results in increased energy, relief of arthritis and joint pain, mood enhancemnt and increased mental sharpness. Many believe that the combination of colloidal gold and silver works better than just silver or gold alone - especially when it comes to fighting cancer tumors.
In the case of the above post, those three items are what the pet's owner has been using and so that is what I reported.