One of my goslings has ripped the webbing on its foot. Its limping, quite badly so I washed the foot and have it separate. It has food and water - should I use Pen-G around the affected area?
How big is the gosling? I myself wouldn't use the Pen. If you keep the gosling in a clean (relatively speaking here) area, the webbing will heal on its own.
As greyfields said, they are very resistant to infection.
Pen-G is long acting. I would give it twice two days apart then monitor. It really can't hurt and the webbing of the foot is probably the most prone place to infection on a goose. As mentioned they are veyr resiliant... but I've treated about 4 bumble foots already this year.