>>My husband and I have a 3 year old rescued Boxer who was abused in her former home, we believe. She is the most loving dog I have ever known. She has been through obedience school and is mostly well-behaved. She has a tendency to destroy items such as sheets and mattresses when we leave her and our other dog alone for any length of time other than a few minutes. She also refuses to eat whenever we are not around, which makes boarding her at a kennel difficult. She had puppies last December and has been overly aggressive towards strangers ever since. Any hints as to how to deal with these issues? Thanks!!
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Sounds like separation anxiety. She might benefit from medication and the recommended behavior modification exercises for that problem. Medication alone doesn't work, but behavior modification alone sometimes does. For one program, you can get Patricia McConnell's booklet, "I'll be Home Soon." Or get a referral to a veterinary behavior specialist from your vet.
The increased aggression after having a litter can come from experiences the dog has while the hormones are changed for the pups. A behavior specialist can address that, too, or you can deal with it however you normally do in your classes. Another factor may be that she was maturing at the time of having the pups, and coming into her inherited temperament. If you can't change her attitude about strangers, you may have to settle for changing her behavior through training, so that you simply control how she acts, regardless of what she's feeling at the time.
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Kathy Diamond Davis, author, "Therapy Dogs: Training Your Dog to Reach Others," 2nd edition, and the free Canine Behavior Series articles at http://www.veterinarypartner.com/Content.plx?P=SRC&S=1&SourceID=47