Being in unfamiliar surroundings without their most trusted humans coupled with disruptions to their routine are major triggers for dogs with separation anxiety, so jumping right into boarding isn't a great idea if it can be avoided.
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If possible, dogs older than 6 months should not be left alone for longer than 4 hours at a time. If this is difficult, the absolute maximum time for them to be alone is 8 hours, but this is only recommended if your dog has a way to get outside for a bathroom break.
1 Answer. This is a very interesting question and it hit home for me as well because I travel quite a bit for work. I did some digging and found an article with input from a veterinarian. In short, most dogs are ok away from their owner for 2-4 weeks, and it does not damage the relationship.