Do you have more than 2 dogs? (If so, please comment on how much extra effort it takes for each additional dog)
Just one is all I need at a time.
One dog and two cats. However I dog-sit for friends frequently and they have two dogs. Because they constantly have someone to play with and get excited with, they seem more hyper. However, the normal dog owner duties (walking and feeding) are not...
Much harder. You do have to buy double of everything though.
We have 4.
The first adds the most work then after that each adds about 1/3 more effort
The food bill for them is about $200 a month.