it depends what dog, some dogs need extra washing and treatment
because of long fur and infections. Size also effects the care for
a dog. Some big dogs require big meals and small dogs require small
meals. They are hard to take good care of because you need to
de-worm and treat the dog for ticks fleas & other
parasites.
If you give a dog a good clean every couple of days and feed
them regularly to keep them healthy, there's no problem you will
have for looking after a dog.