We both work full time, and have 2 large, fairly high energy dogs, and we make it work!
We are up between 5.30 - 6am every weekday. Walk the dogs, get back and feed the birds etc, feed the dogs. Feed ourselves whilst the dogs mooch, get dressed for work, make up the dogs stuffed Kongs, then leave the house by about 8.30am.
We're back again at 6pm, dogs are let out, walked again (most nights) and then spend the rest of the evening with us, either outside working, or in the house. We don't go to bed until about 13.30-11pm, but often the dogs will mooch upstairs earlier than that and warm the bed up!
Both dogs are past puppy age (being 3 and 4), and are very routine based. However, it took a while for this to work, and we have invested, and continue to invest, a lot of our time in making it work.
I would love to have a dog walker, but both dogs aren't particularly 'other dog' friendly, so can't be walked with other dogs, plus the money aspect. I haven't got £50+ a week spare to pay someone to walk them at lunchtime (for example). We have no family in the area, and frankly, I wouldn't trust anyone who didn't know my boys inside-out to walk them anyway.
The breeder of our dogs knew we both worked full time when we bought the boys (she works full time herself), and we knew it was the only way we'd get a dog, given that a resuce would never rehome to us, because we work.