My two cents on adopting a dog or cat:
I am an animal lover and I love both dogs and cats.....Having said that, for people in our age group (generally 60 and over) I would definitely recommend a cat and here's why.....
Travel:
Most cats are 'homebodies' and prefer familiar surroundings, but many cats travel very well with their owners. Some cats actually love to ride in a car, bicycle or pram. Cats can also be left at home for extended periods of time. A well behaved cat can be left home alone for an entire weekend and she'll be fine and even content.
Dogs on the other hand, get lonely. Some dogs will destroy things (like bedding, rugs or furniture) if they are left alone for too long.
*Bathing and Hygiene*:
Cats don't need to be bathed regularly because their fur is normally clean and odorless. They do need to have their nails trimmed regularly and their fur brushed.
You don't have to walk a cat because a cat uses a litter box inside and they don't need to be house broken.
A litter tray only needs a few minutes daily and a once a week change to stay clean and fresh at all times.
Dogs need to be housebroken and have a lot more 'accidents' inside the house. Dogs often leave poop where they shouldn't, such as a rug or the neighbor's yard. A dog has to be walked at least once or twice a day to do its business.
Licensing:
Unlike cats, dogs have to be licensed. Dogs have been known to destroy flower beds and some dogs can be aggressive with strangers. Many a dog has gotten their owner into legal troubles.
For the most part, cats are quiet, calm creatures and they can't bark. A cat can be just as affectionate and playful as a dog, but won't demand as much attention, even if kept indoors. Indoor cats are healthier, much cleaner and they tend to live longer, than their outdoor counterparts.