I agree with Ellie and Baby Girl. Having more than one dog can be a joy beyond belief.... and work/cost beyond belief!!
I have three. The two older ones are fairly easy, they are bigger shih tuz so they don't go with us that often. I used to get dog sitters to walk them if we were gone overnight. Then came the princess

Traveling with three/ walking three/ feeding three/ bathing three/ the cost of preventives of three/ etc etc
It is.. well.... interesting. I would not change a thing but it did change my life.
Like Elle, I have turned down vacations because I had to do what was right at that time for my pack. Grooming is a major expense now.. so I have to prioritize some other things. But it is all good. In my life the payback far outweigh the cost.. but that is me.
Also.. they do play alot and is fun to watch!!
The one thing I would change... I homecook now.. and I miss the days that I guilt free just poured kibble in their bowls.. awww *sigh**