Do dogs know who their siblings are?
Steven R. Lindsy has theorized dogs do have the ability to identify their siblings later in life and can also identify their parents as well.
However, this is generally only the case for puppies who spent their critical socialization period with their siblings from when they were born to about 16-weeks old.
Many believe it's instinctual behavior, harkening back to the days when your dog's wild ancestors would mask their scent to help them sneak up on their prey.
Wolves, for example, have been observed rolling in animal carcasses or the droppings of plant-eating animals, to cover up their own smell during the hunt.
Safe: Some Vegetables.
Your dog can have a healthy snack of carrot sticks, green beans, cucumber slices, or zucchini slices.
Even a plain baked potato is OK.
Don't let your dog eat any raw potatoes or any potato plants from your pantry or garden.