i have read that white vinegar is also used for a dogs coat but i dont know if you can put it in the food/water,i only use apple cider vinegar ,i put in her water/food,and spray her withit also,have you checked your dogs ears?i have been having trouble with some form of allergy with annie i put it down to kibble,the vet said frontline!!,well she has been so good up till yesterday,she was absolutly itch free but when i came in from work i had to take her straight to the vets,her ear was so inflames,red pustles all over her stomache and all infected,but her ear is terrible,now she has never shown any symptoms of yeast in her ears which i think is strange,anyway shes on antibiotics,steroid cream for her ears and a strong antihistamine all of which i was trying so hard to avoid!!,strange thing is on tuesday when she was itch free i took her for a run on our local field and also i noticed that the tree stumps where we live have all been sprayed and have white rings around them where pesticides have been sprayed!!,so no more field running or walks for a while come to that i will excersize her in my garden ,karen