If this is not possible, make sure that when you return home enjoy quality time with the dog, because they can feel a sense of abandonment which may manifest in poor behaviour and moods.
If you still decide to introduce two dogs, do it in a public place, on foot, with both dogs with a collar and leash, then bring the new dog to your home while still on a leash, let the dogs smell each other, check and get to know each other, and allow the situation to be under control.
Try not to change a routine, although sometimes it is difficult, you will be surprised but dogs do not like changes.
It’s important to ensure that you establish healthy relationships with dogs so that they can always feel happy and healthy!