I recently decided to make an appt to neuter my male dog. Appt is scheduled. This past sunday my sister gets a female pure breed dog. ( I had no clue she was looking for one) She wants me to cancel the appt so that when her puppy is old enough they can have puppies. Her dog is registered pre breed dog and so is mine. She says she wants to mate them only once and sell the puppies then after that I can neuter him. I want to neuter him now because he’s older now and he’s wanting to go with dogs a-lot and he’s leaking. But I also feel like im being a bi*** for not doing this favor for her this one time. What would you do?

she will pay me for letting her borrow my dog.