:hello: Welcome to the forum. My goats eat wild grape vines on occasion depending on where their browse area is located and if the vines survived the goat assault from previous browsing. I do not make a point of clipping the vines as a source of food to offer them though. If these are domestic grape vines whether or not chemicals (pesticides, herbicides, fertilizers) were being used on the actual vines, leaves or added into the soil would be a consideration and reason for caution. Also, good rule of thumb when feeding goats a new food source of any type, start with small amounts to begin with to introduce them to the food. There are risks of digestive upsets when they eat too much of a new or unaccustomed food at one time.