Given that all of the following are true, which one, if added here, would provide the most effective support for the statements made in the preceding sentence?
F. The dog’s owner should immediately try to determine what the dog is responding to.
G. Dogs are often fearful of unusual or unfamiliar situations and people.
H. It is important to have a dog’s hearing assessed by a veterinarian and to check the ears frequently for mites or ticks.
J. Many purebred dogs have their ears trimmed or clipped in a particular manner to suit their breed.