For the last six months we've been caring for three feral kittens that were left at our home by their mother just before she disappeared. We've managed to tame them considerably although a couple of them are still somewhat shy. They respond enthusiastically to their feeding times both morning and evening by engaging in typical behavior of trying to trip me by walking through my legs and feet as I move to their feeding bowls. For the past two days I've notice one of the male kittens begin to wheeze severely after a few moments of excitement when I bring on the chow...eventually it passes but I'm concerned that this might be an indication of heartworm. Does anyone have an idea of what might be happening to him?