I had 1 for a year and decided to get a second. Oliver is a rescue and is so scared of pretty much everything, but seems to do better when other dogs are around.. so I thought having another dog here all the time might help. (and it is helping, slowly, but helping!)
Things I didn't quite consider as much as I should have - COST... Mya has gotten SO expensive... just to get her up to date on shots and heartworm (includes Oliver's heartworm too, they share a box) was almost $500. Now we are looking at spaying her, likely another $400. Hopefully after that the financial burdens settle down and we're off to the occasional visit and once a yr shots.
Jealousy is also another big factor for us.. treats, toys, and my attention. Oliver is kinda rough with Mya too, so I really have to keep a close eye on them as they play. Now that she's almost his size that's gotten better, but when I brought her home he was nearly 10 pounds heavier than her... it was nerve wracking.
That being said, it's really awesome to watch them together. Oliver is even helping with potty training.. if she's doing something in the house he will come and tell on her - barks and runs to where she is, if I don't follow, he'll do it again. He also goes and gets her outside when I want them inside.. it's too funny! He is starting to enjoy her more and more as she gets bigger and can really rumble with him. They love to wrestle and chase each other around.
You'll need to make sure that your pup likes other dogs and seems to enjoy having them around. Some dogs like to be the sole canine and will really resist another dog moving in.
I don't know that I will ever go back to one dog again. For me, the benefits outweigh the annoyances, but it's a personal choice. If you have the time and money, and you think you can handle 2, go for it!
__________________ Oliver & Mya are my  |