We have a nine year old mixed lab that was gotten from the local Humane Society equivalent. She currently weighs about 25 kilograms and is in perfect health. She looks skinny, but she has always looked that way and the vets say that this is normal for her mixed breed. For the first six years she was terrific: very obedient, never harmed a child or another animal, never ruined a thing, never ate scraps outside the house.
When she was about five years old we moved house and about a year after that she began eating scraps outside and then chewing things in the house, mostly bags (both plastic and cloth), and had even chewed furniture once. Today I came home to find that she ate a plastic DVD case that had fallen (or more likely been knocked off) a table. She also cries terribly when left at home alone, and we often come home to find her food bowl (but not her water bowl) upside down and the food thrown about. Thinking that she is not satisfied with her food, I've tried changing the brand of her food several times but this has no effect. I've tried all the major brands and most of the smaller, less expensive brands as well.
When the dog was at the Humane Society she was given an antibiotic that stained her teeth, so they look rotted but they are not. I have pressed and pulled at her teeth to see if there is any pain, but there is none. Also, her gums and tongue look fine. Her poop does not have any unusual properties, and her coat is healthy.
What could be the cause of her tantrums and destroying bags and cloths? She refuses to play with dog toys (always has) so I don't think that it is boredom. Likewise, I think that I've ruled out dissatisfaction with her food.
Here are some pictures of the dog if it helps to better identify the breed and thus the behaviour:
- As a puppy:
- Not as a puppy: