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.
There are two main considerations. First, a puppy's immune system needs time to accommodate the necessary vaccinations. Depending on the disease profile of your area, that could mean it's not safe to walk him until he's about 16 weeks old. Second, until the puppy understands leash walking, you're likely to do more harm than good dragging him around like so many people do.