Do dogs get lonely? Yes, dogs do get lonely. Dogs are descendants of wolves, pack animals who do pretty much everything together. Wolves sleep together, hunt together, eat together—you get the picture.
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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.
Generally, dogs tend to spend a good part of their day alone because their owners are away at school or work during “working hours.” So it's not unusual for a dog to be alone for 8 to 12 hours daily. But what about leaving a dog alone overnight? That's not a good idea. A dog needs human contact.
As your puppy gets older gradually increase the total amount of time you leave them alone. Adult dogs are generally okay on their own for 4-6 hours a day. But, many dogs are good at adapting to being alone for 8-9 hours while you are at work if they are provided with enough space to comfortably move around.