Two patients limp into two different American medical clinics with the same complaint. Both have trouble walking and appear to require a hip replacement.
The first patient is examined within the hour, is x-rayed the same day, has a time booked for surgery the next day and, within two days, is home recuperating.

The second sees the family doctor after waiting a week for an appointment, then waits eighteen weeks to see a specialist, then gets an x-ray, which isn't reviewed for another month and finally has his surgery scheduled for 6 months from then. Why the different treatment for the two patients?

The first is a Golden Retriever.

The second is a Senior Citizen.