I have used the AnimalIntex pads for strains and other leg issues with great success.
I have never used them to draw an abscess.
What I have found to work the best for an abscess is plain old Epsom Salts and warm water.
I had been soaking my horse twice a day for 3 or 4 days. It was the first and only abscess I'd ever dealt with, so I called the vet, in a panic, on the 4th day.
He dug the abscess out and thanked me profusely for making his job easier.
He said soaking in Epsom salts was the best thing I could have done and it was already past the half way point of being ready to blow.
All while he was handing me the bill