My Lab wont come anymore

Question
We have a 3 year old chocolate lab and a 7 month old yellow lab. It seems like my chocolate lab doesn't listen like she did before we got our puppy. We still are just as affectionate as we always were, could she be testing us somehow?  

Answer
It isn't unusually for a dog to take an independent turn when its personality matures at 3 years old.  Add a new puppy and maybe a who needs them attitude, and you could have a problem.  

Just got a new, revised manual.  One statement in it says never give a command you can't enforce.  So you tell the dog come outside in an unfenced area, and what do you do if it doesn't come?  I.E., this isn't a question I can help much on.  

With the dog at the end of the leash, call its name and "Come" in a firm
voice. If it comes, praise it lavishly and pet it. If it doesn't come, repeat
the command and give the leash a light snap. Keep it up with firmer leash snaps
until the dog does come. Do not forget the praise.  Then switch to a longer
leash or rope, about 25'.  When it comes well on the longer leash, you should
be able to go to off leash in a fenced area, etc. Once the dog is doing well, introduce come, treat. This is for emergencies only when the dog has gotten loose accidentally.  Use it routinely and you will have nothing to fall back on when your dog is headed for a busy street. "Name, come treat!" is little different from the regular "Name, come!", except the dog gets a great treat when it comes. We are talking a hot dog, cheese, etc. much better than any treat you use routinely.

Relying on come to control most dogs loose outside is risky, and I do not
recommend it.  Dogs are individuals.  Some can be trained to come when you have
no way to enforce it, but some will never be completely reliable even for the
most experienced trainers.