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Originally Posted by gemy  I do second that advice. It could be anything physical that is causing pain and creating a "nasty disposition". An infected gum line, tooth decay, uti, etc.
Sudden behavioural changes usually signify a physical problem. But sometimes they are really not so sudden, but have slowly built up over time.
It is just we dismissed this response or that response.
The key is to rule out physical problems. Then to address the behavioural issues.
There are some good training video links, posted in the Training forums. You could do a search for "dog aggression to ppl" |
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Originally Posted by AngelFae If you can rule out physical issues it may be that he had a big scare and now needs a bit of retraining. He has to relearn that 1) he doesn't need to be your protector 2) that he will be ok around these "strangers" and 3) to do what you want him to do when someone comes to the door.
Best of luck! |
Yes and yes! After you rule out the possibility of a physical problem, address the behavior. It might seem sudden to you, but it might not be. Have there been any changes in your life? New boyfriend, did you move, did your work scedule change, change groomers, etc etc etc. a change in their life can cause a behavioral change. Also, you may not have noticed a glare or small kick coming from the pizza man as you were counting your money. That can cause aggression too.