Guides
The reasoning behind the calculators, in plain English — including the bits where the honest answer is "nobody actually knows".
How long do dogs live?
12.5 years is the median — but breed spans ten years and size spans ten months. The full 155-breed table.
How big will my puppy get?
What genuinely predicts adult size, what's folklore, and how badly the popular formula misses — measured on 63,993 dogs.
How to calculate your dog's age
Why × 7 is wrong, what the common size-based table really is, and where the science actually stands.
When is a dog considered senior?
'Senior' is the last quarter of expected life, not a birthday — and the size effect is far smaller than the rules of thumb claim.