dogs targeting boars only

years ago my brother and I mostly caught sows and shoats. We didn't have a training pen so we staked out shoats and sows or turned them loose for training our pups and dogs.

Meanwhile a friend of ours kept catching mostly big boars. He had a training pen and always used a boar for training.

One day my brother and I built a big training pen and used a big boar for training. We went from catching mainly sows and shoats to catching mainly boars.

My brother and I theorized that it had to do with training with a boar. Some hog hunters say that the boars smell is stronger, and that is why the dogs will naturally trail the stronger scent. I do not think it has much to do with the stronger scent in most cases.