I'd probably try and wait a little bit, trust me I'm itching for another dog (my chessie is 1 year old) but you have to remember adding another dog, you don't have the same amount of time for your puppy. If you end up with a problem (and they do arise, ahhh adolesence) you will have less time to deal with it. Having two dogs it could also make more problems, dogs either bring out the best in each other or the worst. Don't be too hasty, enjoy your puppy's puppyhood, trust me I can't wait for my next dog but if you do it too quick you will miss out on a lot.
one last thought, a 16 week old puppy and 1.5 year old seems like a good idea until they're 10 years old. You'll have two old dogs so when they pass they'll probably pass around the same time or have medical problems around the same age.
one last thought, a 16 week old puppy and 1.5 year old seems like a good idea until they're 10 years old. You'll have two old dogs so when they pass they'll probably pass around the same time or have medical problems around the same age.