I think with time and the wisdom of age, he may settle down. They hate their pack separating, my 2 are 5yo and 3yo and if one of us ventures off, they will still be very alert to the fact and if possible go looking or just sit and wait. With the vocal part, imo it is nerves/anxiety at the pack member leaving the group, with trust and experience he will settle down - but they don't like it.
if your GSD is eating and eating and eating and losing weight - please consider testing for EPI.
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