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Hi, I'm Dr. Peter. Welcome to JustAnswer. I'm reviewing your question now, and will post back with your reply ASAP.
Karen, I am sorry to learn Dublin has an abscess in his shoulder. In response to your question, the catheters we use to place in the front leg are short, about 2-3 inches and will not travel so far to the shoulder. Very seldom do we see abscess or infection as we sterilize the area. If an infection were to occur it would likely be limited to the area where the catheter was placed. It is not likely that the abscess Dublin has in the shoulder to be related to the catheter placed in his front leg, even less likely if it was placed 1 month ago.
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