A four-legged friend?

For a couple of years I've been thinking about getting a dog.  There are so many positives that they add to life, and I long for a little companion to fuss over & cuddle, who will love me back adoringly.  But I know that this is about satisfying my needs, and may not be the best thing for the dog, as I am at work for long periods 4 days a week, so it will have to be alone for that time, which may be difficult.  Lots of people do have dogs that stay at home while they work though, and if there are regular walks, and toys to play with during the day maybe it'll be OK.  I shall keep thinking about it...