Animals don't experience Time like we do

Our mother's dog has long considered my brother and I "part of the pack." She is happy at our house, and knows she is safe. But Mom is still the Alpha of her pack, and when Mom is away, she is unhappy and eager to get her back. It doesn't seem to matter if Mom is away for 5 minutes, 5 hours, or 5 days. Scientists are now saying this may be a constant in the animal experience, as they may have no sense of duration of time. They know past, present, and future. But unlike humans, it appears other animals can't tell the difference between seconds, minutes, hours, or days in their memories.