When I was younger, I knew a fellow who acquired a dog to reinforce a running habit. If you start of running with the dog regularly, it will come to expect it of you which is a great way to get accustomed to running on a consistent basis. That said, you are probably more tolerant of heat than most dogs, so be careful in the summer.
Also, different breeds of dogs have different capacities for long distance running. You may reach the stage that your long runs are longer than the dog thinks is reasonable. There is nothing to stop you from running loops from your home, leaving the dog after it has run enough to be tired.
Setting aside time for running or any other physical activity on a regular basis doesn't need to hinder your work. It's more likely that you will decide that something needs to get done so you put the running aside. Remember that balance will make you more productive at work.
Depending on your community, it may also be possible to find a group to run with once or twice a week. Just like having a dog to encourage you to get out and do it, running with the same set of people on a regular basis will get you going even if it's raining, or the demands of work are high.
Don't set your expectations too high in the first several months. Find out if running really is for you before you commit yourself to really long distances.
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