The Lifetime Cost of a pet is always much larger than merely its price thanks to equipment (beds, cages, bowls, leaches) and medical (vaccinations, spaying or neutering) costs, not to mention recurring costs such as food, grooming, booster shots, tick/ flee and heartworm medication.
The levels illustrated in the chart are approximate as every family will have different thresholds for what they consider to be a reasonable amount to spend on a pet's care and wellbeing. Whatever guidelines your family uses, you'll be better prepared to have a conversation after having calculated the DIMS SCORE®.
The average life-time cost of a medium size dog assumes it takes roughly $200 a month to feed and care for a family dog, after initial costs such as spaying/ neutering and training.