"Porkzilla" or "The Secret File of the Bacony Behemoth"

Two farm girls are giving their hog a special formula so they can get revenge on not winning the prize hog contest at a fair the last year. But the hog ends up drinking too much of the formula and grows to a spectacular size! He leaves the countryside and rampages through town. And Ralph must trust Scribble to come up with a special food to attract the pig away from the city.