Barking is not only fear based, sometimes it can be excited or frustrated, depending on the sound of the bark itself and the body posture that presents with the barking. Sometimes dogs that get excited by other dogs will try to get to them, and when they hit the end of their leash they are frustrated and will bark. If it's a bigger, deeper bark at this age it's probably more likely fear.
With this kind of situation I am of the opinion that you should take socialization very carefully. It's not simply getting her used to things...(although 4 months is around when my dogs go through a fear phase and it evens itself out)...but it's about building confidence. She needs lots of exposure and she needs to not be overwhelmed.
Some pet stores trainers are good and some are TERRIBLE. I've seen PetsMart trainers greet a nervous dog by squatting over the puppy, petting very vigourously until the puppy collapses and submits. They don't relaize that's what's happened...they jsut think they're loving on the puppy. They go to a short course and that's all it takes to get their certificate, so be careful and I wouldn't necessarily consider them an expert on dog behavior.
If she is barking and nervous around people/dogs I've always found that the best thing is to first deter the behavior (such as a little leash pop to break concentration or a verbal No) and in general give them something else to do. If I was in a situation where I was just talking to another person and my dog was carrying on I would just have the person ignore the dog and talk to me for a few minutes. After the pup appeared to relax, I would then ask them to bend down, position themselves sideways, and offer the puppy a treat...and go from there based on the reaction of the pup. If I was walking down the street and my pup started carrying on, I would deter the behavior and perhaps pick up speed in my walk so that my puppy would have to start to refocus on me and when that happened I would praise the puppy. You're not really going to want to flood her, but rather take a slow systematic approach to densensitization.
Bianka vom Eisernen Loewen IPO3, CGC, TC 1-3-08
Cade vom Eisernen Loewen IPO1, CGC 3-25-09
D'Artagnan (Tag) vom Eisernen Loewen BH 2-2-10
G Aiko von Burkndeiros SchH 3, IPO3, FH, TC, KKL2 9-17-02 (Retired)
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