I was hoping to get some responses back from my information request before answering.
I asked about when she was fed because if a dog is having a liver issue, when fed, the liver may not be filtering the blood well enough and toxins can build up leading to seizures. Dogs can act in various manners when experiencing seizure behavior including vocalization. Now I wouldn't jump to this specific problem without first ruling out strict behavioral issues.
One thing I do need to mention is that you should not physically smack a dog. When you do, you teach the dog that physical reprimands are ok. The only form of physical reprimand a dog has is to bite. So we never recommend hitting a dog.
At this age a dog has a lot of excess energy. They need a lot of exercises. So the walk should be a fast paced walk and not a leisurely stroll where the dog is allowed to sniff and eliminate and socialize. You should have a destination in mind and walk there at the fastest pace you can. Once there, you can allow the dog time to sniff and eliminate before turning around and coming back. This actually tires the dog out where the other type of walk does not.
You might also try to plan a play time at this time. Many dogs bark, growl and snarl as an attempt to get someone to play. However, they will do the same thing in an attempt to control an owner. They learn they can intimidate a person by growling. This can be corrected with concentrated obedience training and work.
The following site is helpful for teaching you how to train your dog. Be sure and click on the link to the page on obedience at the bottom. and links on subsequent pages leading to detailed instructions.
Training works best if you train at least 30 minutes a day (two 15 minute sessions). I would start making your dog work via the Nothing in life is free program (NILF). It is outlined below.
However, you also need to rule out medical issues that can cause sudden aggression like hypotrhyrodism. You can read about these on the following sites:
I hope this information is helpful to you and you are satisfied with my response. If you would like any additional information or have more questions please don’t hesitate to press the reply to expert or continue conversation button so I can address any issues you still have .