Updated May 09, 2016. Cecum cancer is a type of colon cancer, but the signs and symptoms of this disease are sometimes elusive. The cecum demarcates the beginning of your large intestine. This pouch-like section of intestine connects a portion of the small intestine, called the ileum, to the ascending colon.
Most good breeders don't let their puppies leave until around 8 weeks of age (and in toy breeds, 10 or 12 weeks), which means that your puppy may not have been leash trained prior to you picking him up. For large breeds, this may not be the case.
Puppyhood generally ends sometime between 6 and 18 months old, depending on the dog's breed. Adulthood can start anytime between 12 months to 3 years. Small dogs usually mature earlier and live longer than large dogs, while large dogs have longer periods of puppyhood and adolescence.