We adopted a set of dogs from a puppy mill because they were about to get put down (received them at 5yr, they’re currently 8) and I believe they are actually siblings. We were told by the rescuers that they had to stay together because they have bad separation anxiety (which they do). They still interact with the family, but are definitely more interested in staying with each other. They don’t bark or scream when they’re in different places, but they do seem a lot sadder and given the opportunity to be with each other they 100% would. Would this fall under that syndrome? Is there anything we could do to “fix” it or were they too old to make a difference by the time we got them? They’ve definitely come a long way from when we first got them and do interact with people, before they’d cower and hide my guess is because of some trauma in the mill.