I adore dogs. They are a joy.
When I lived in California, I had a small pet sitting business for over 10 years. I had close to 12 clients. At that time I also did pet sitting for cats and birds and even an iguana [I adored that iguana and was very sad when his owner returned after a month of being away]. So if you have cats, as well as dogs, I would be able to care for both of them ...
What Annie would like to know about your dog
I most definitely need to meet the dog in advance to see if we bond. IMHO it is quite important that the dog sitter and the dog like each other.