I Woke Up This Morning And My Dog's Foot Was Swollen Up Pretty Big. What Should I Do To Get The Swelling To Go Down?

I would have your dog examined by a veterinarian to determine the cause of the swelling.  It could be an insect bite, trauma, infection, or secondary to a tumor.  It is much easier to suggest treatment when we know what the problem is.  You can try giving Benadryl at a dose of 1 milligram per pound of body weight by mouth three times a day.  Do not use the Cold and Sinus variety only plain Benadryl is safe.

I got home from work and my dog was fine. I walked her and she was fine. Once she came inside she ate and laid down, when she got up  about 20 min later she was limping and now about 4 hours later it is swelling up.  What might this be and what can I do for her.