 As a result, the terriers often weigh considerably less than the fox (10 kg/22 lbs) and badger (12 kg/26 lbs), making these animals formidable quarry for the smaller dog.Terrier work has been condemned by British animal welfare organizations such as the League Against Cruel Sports, the International Fund for Animal Welfare, and the Royal Society for the Prevention of Cruelty to Animals, because it can lead to underground fighting between the animals, causing serious injuries.The British National Working Terrier Federation denies that underground fighting is an issue, arguing that the terrier's role is to locate, bark, and flush out the hunted animals, not to attack them.