I'm looking after a friend's labrador at the moment who's scratching and licking himself intensely on his underparts and his paws. Apparantly it started a week before he came, my friend has ruled out fleas, she gave him a dose of expot and asked me to keep an eye out. Given the time of year, I'm wondering if its mites and if a dusting of Thornit powder would help?(its actually Clearit, couldn't get Thornit but think its the same probably). I can't find any real clear information anywhere as to whether it would be poisonous if he licks it though. Can anyone help please? The skin just looks very dry and he is moulting anyway at the moment but there's no other obvious signs. Any advice gratefully received! Thanks x