The comprehensive infusion fee at a pet hospital is the total cost including fluids, medications, and other related costs. Pet owners need to pay these costs because their pets are sick and need to be treated. Although the infusion costs are more expensive than the dog itself, the profitability of the pet hospital is their primary goal, so they will certainly charge accordingly to maintain operations and profitability.
Overall, the combined infusion fees of pet hospitals are reasonable because it is a cost they have to pay in order to provide medical care.