My chocolate lab is 10 years old, is at an ideal weight and never chews anything other than her own toys. She never chewed any of the grand kids' balls or toys. She can always differentiate between her toys and grand kids toys. But she is slowing down a little. She takes a break from fetch the ball every now and then.
I’m always amazed how our mutt (black lab, great dane) knows which toys are his and has never bothered the stuffed animals, socks, etc. Our previous mutt was pretty good too, but on a few occasions would chew a stuffed animal. One that I recall was more of a statue - stiff, of a tiger. Turns out it was some sort of real animal hide that had been dyed to look like a tiger. My daughter at the time was devastated - it was bought by her Nana on a vacation.
Thank goodness for Ebay - and the exact replica is on her shelf still. Although she never loved it like the original!
Both never went into the kitchen or bothered food on the dining room table. The first mutt would eat food left low on the coffee table or the floor when the kids were little.