Final answer:
The primary source of revenue for a vet practice is from veterinary services, as these are the main services provided. Grants, donations, and pet adoptions could contribute, but are not reliable or significant income streams.
Step-by-step explanation:
The only money available in a vet practice is the money collected from vet services. This is because the core business of a veterinary practice is to provide medical care to animals, which involves services such as check-ups, surgeries, vaccinations, and emergency care. Income from these services constitutes the main revenue stream for a typical veterinary clinic.
Veterinary practices might sometimes receive governance grants or volunteer donations, but these are not considered consistent or reliable sources of income. Pet adoptions could also potentially generate some revenue, especially if the practice is associated with a shelter, but this is usually not a primary financial contribution to the practice's budget.