I have three dogs so I can't talk but... I did find three a lot more work than two. Two is manageable, easier to walk, easier to feed etc. With any more than two dogs you have a real pack. You have to be extra careful at feeding time (we feed all of ours seperately). Walks are more difficult (I do two walks, one dog at a time, our eldest dog doesn't have the same exercise requirements as the younger two). The cost is a lot more.
But if you feel its the right timing and right for you and your other dogs... go for it!
But if you feel its the right timing and right for you and your other dogs... go for it!