My Min Pin has had a pretty bad reaction to the rattlesnake vaccine. He has developed a LARGE bump on his neck/shoulder where the vaccine was given. The injection was given 10 days ago. The dog scratched the area and made a hole for the fluid to drain. I lightly pressed around the area to get the rest of the fluid out. It was mostly clear with maybe 1/3 blood content. I couldn't get in to see the vet today, but will see him tomorrow. It also appears he has loss of tissue in the injection site.

Is there anything I can do to help with this situation until I see the Vet?

I really think you should not consider this vaccine safe for some dogs. My dog is approx. 12 lbs., 5 years old, and in excellent health.