http://www.hsus.org/pets/pet_care/myths_and_facts_about_spaying_and_neutering.html
摘录几个，有些ID也是这么认为的：
MYTH: It's better to have one litter first.
FACT: Medical evidence indicates just the opposite. In fact, the evidence
shows that females spayed before their first heat are typically healthier.
Many veterinarians now sterilize dogs and cats as young as eight weeks of
age. Check with your veterinarian about the appropriate time for these
procedures.
MYTH: I'll find good homes for all the puppies an
