My 14 year old dalmatian, Cassie, had what we thought was a fatty tumor on the side of her jowel...it was there for over a year. She really was getting slower and acting like she really didn't feel well, and we thought maybe she was really getting on to the end of her life....Well, over memorial day weekend it burst, and it was just full of infection. Long story short, the doctor didn't think antibiotic would work so he cut it out...ended up being some sort of cyst. Within 36 hours after the anesthesia wore off completely, she was like a different dog....feeling so much better, running around the backyard. I felt horrible because I just figured it was fatty tumor like the other couple she has. So, again, long story short, your Ellie will feel so much better when she gets rid of that old infection. I'm glad the antibiotics are working....Cassie's drained but it keep filling back up (for lack of a better medical term) Keep us posted on how she is doing!!!