After losing our last dog after 9 years to a bowel obstruction, we recently found a new dog; an 11 month old (estimated) Pyrenees-Labrador mix, female, we rescued from a shelter.
Pepper, as we named her, has been the sweetest dog I think I've ever met. Gigantic for still being a puppy, she wants nothing more than to have her belly rubbed and give lots of kisses. She spends the days with my teenager (who is doing her first semester of college at home, online), then ends up sleeping with my wife and I where she cuddles and generally behaves herself.
We've had Pepper a little over a week now. She responds to "sit", is for all intents and purposes house broken (we take her out every few hours and she's only had some minor peeing accidents). She was super skinny, malnourished when found, but is starting to put weight on after a week of Science Diet for puppies.
She doesn't have any aggression--she's picked up things in her mouth and we can reach in a pull them out without any biting (a far cry from our last dog who snapped and bit if you came too close to her food bowl).
Pepper however, has suddenly become crazed with chewing. She's destroyed all three of her stuffed toys in the past three days, pulling the stuffing out etc. Last night, I got her a Kong SafeStix and she went nuts for it. Now, today, while my teen was in the bathroom, Pepper pulled her cell phone off a counter and began chewing it--cracking the screen, despite an otterbox case on the phone.
I am guessing this sudden change in behavior/hyperactivity is due to several factors: she's now a week out from her spaying and must be feeling better; and she seems to be adjusted to her new home and yard.
Or is it something more? Anything we should be worried about? She gets her first vet visit in a week. Our last Pyrenees mix (Pyr and Australian Shepherd) was overly guarding but never chewed like this dog, and was nowhere near as energetic.