One of the common triggers for homesickness in dogs is traveling. Spending too much time away from home might cause your dog to start missing home. Leaving your dog at a dog sitter's house might also bring homesickness to the pooch.
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“So many owners have heard the old advice to ignore your dog when you leave and when you come home, but there's really not any evidence for it,” says Zazie Todd, PhD, author of the website Companion Animal Psychology and the Psychology Today blog Fellow Creatures.
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.