Years ago, I lost my own personal pit bull to a fast growing brain tumor. Unfortunately, in both human and veterinary medicine, brain tumors can result for no known reason. While genetics and environment may potentially have a role, the underlying cause for brain tumors is typically unknown.
The Havanese does not have to be really light. Depending on the size of a Havanese the weight ranges from 7-22lbs. I own a very athletic agility Havanese that stands 11â³ at the withers. She weighs 18-20lbs depending on how much training she does and her muscle mass. From the AKC Standard.
In height they generally range from the Standard's minimum of 27 1/2 inches up to 36 inches for the exceptionally tall ones. They can weigh anywhere from 110 pounds to the 343 pounds of Zorba, the world's largest dog, although most Mastiff males weigh around 160-230 pounds and females around 120-170 pounds.