
Growing up and till I got my first dachsie we had only ever had one dog at a time, then I got my dachsie Rhuari,my cocker Kim was 15.5yrs old and looked at me as if I had lost my marbles, my Mum had got her dachsie Penny a year earlier and if she couldn't take her with her she came to stay with me, sometimes just during the day or over night occasionally, Kim really perked up when she was around so I felt it would be OK to get a pup of my own, Kim soon realised that this one was here to stay and accepted him very well and both dachsies at times, he would sit on the sofa and watch them chasing each other,they were together for a few days short of a year when Kim passed away, I didn't think that Rhuari was that affected, he still had Penny to play with and stayed at Mums when I was working nights.
Ten monthhs later I got Chase, Rhuari was besotted, from day one she made it clear she was top dog and he was happy to fall into line, it was only then I realised he had missed having doggie company all the time.
As has been said it does depend on the breed and the temperament of the dog, I had the chance to see how my oldie would react to a pup before getting one but not everyone gets that option.
How does your dog interact with other dogs, if they have a problem with other dogs when out and about then they may not take to having one at home. Sometimes the same sex don't get along, bitches in particular so you need to think about that.