Why does my dog act so strange?

It sounds to me like an invitation to play. Either that, or your dog is just plain crazy. Dogs don't switch aggression on and off every few seconds. When they do it is typically play. That is what she is trying to tell you by running off and coming back all sweet. If she were really angry she would hold her ground.

Some dogs do have a very loud "play growl." Their angry or aggressive growl will sound very different from it. Try this test: if she's a play-growler, she probably growls loudly while playing tug-of-war. Listen carefully. That is her play growl. If the sound you hear in the situation you describe is similar to this one, she's just playing.

An angry gowl is usually lower in pitch, comes from deeper in the chest, and is steadier in tone. A dog growling like this is likely to stare defiantly, hold your gaze, and stand quite still.

Dogs also show their teeth in play. An angry dog will show teeth by raising the corners of the mouth. If your dog is doing this, you have a serious problem that requires professional assistance. When a dog snarls in play, they lift the front of the mouth and wrinkle their nose.

Dogs cannot lie. When they pretend to be mean, they have unmistakable ways of letting you know they are pretending. If you were a dog, you could tell right away by smell, but in your case you will have to learn to read her body language.

There are dogs who are _truly_ psycho and go from sweet pet to savage killer with no warning, as if they were suddenly possessed. Those episodes usually last several minutes and are _extremely_ violent. If that were your dog's problem you wouldn't be writing here... you'd be too busy getting your face and arms stitched.

Have fun!

She sees you as a playmate not a authority figure, obidience classes solve these type of problems very quickly. Petsmart has some affordable ( fun) Bonding classes, that covers everything from sit to Bow. Try it, its always better in the long run

Maybe if he used to be up nearly the kangol (detrimental i could upload) the loud noise will have affected his ears, all of the pastime in and across the residence will have harassed him out, positioned him someplace calm and notice if that is helping him, his backyard so that you can talk has been disrupted in order that might account for the unusual behaviour, take him to the vets if he doesnt upgrade, he might have an harm that isnt visible to you and he cant inform you'll he!

Has someone miss treated her if so this could be the problem. Either way she feels threatend and needs some TLC however no form of aggression should be tolerated but she needs to be treated carfully talk to a dog behavior theripist it may cost money but it may make her feel better

She is seeing you as a littermate and wants to get you to play with her. Try ignoring her when you first get home and when you are ready to play establish the playtime and also you end the playtime. If you ignore the growling behavior she will get the message and eventually will stop the behavior.

Hmm ok that's a bit strange but i have a idea...

It could be from it being treated badly (i doubt that)

Also it could be hungry or thirsty.

It could be in pain to, have your local vet take a look.

Hopefully this helps

Sounds to me like she just wants to play with you when she does that. Maybe try playing with her and see if that helps if not maybe take her to a class to train her against that.