Many thanks everyone. I have stopped using pygmy goat mix or horse cubes - thanks for the good advice. I have a yellow Rockie for everyone. So.... I got some grass pellets as it seemed like something the goats, horses and sheep could have now and again. One of the lambs has turned her nose up completely (although they still come to the rattle in the scoop of course) and one of the goats got severe choke. I guess he thought the pellets were super delicious. I was worried that anything refined (digestive biscuits etc) would not be a good idea but may try a very small amount just as a reward. Onwards and upwards with the halter training....