He should be fine. The anaesthetics they use these days are very quick reversal ones, so although he might sleep well when he comes home he won't be groggy. He can go for a walk, but try to avoid strenuous excercise or letting him jump up. The cone collar is only if he is likely to chew his stitches. Try taking it off when you are there or walking him and give him a bone to chew on to take his mind off it. Doubt if he will fear the vets, I expect the nurses will make a fuss of him anyway. In a day or so he will be back to normal. Keep him warm and quiet for a day or two and he will be right as rain.