Yes! Just like humans, dogs can behave differently in different situations. Just because they don't do something at home doesn't mean they won't do it while their owners are away (they are very cheeky). This may mean they also decide to bring back some of those bad habits you fought so long to train out of.
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Tip: Let the pet carer know which commands you use and when so your dog can continue to be the best pooch it can be.