Because of his short nose, the Chihuahua tends to wheeze and snore. His prominent eyes are susceptible to corneal dryness and secondary glaucoma. Prone to slipped stifle, gum problems, colds, stress, and rheumatism. Don't let him lick or eat toxic products, fertilizer or chocolate. Feed lightly as it tends to gain weight. Chihuahua puppies are born with large heads, frequently necessitating cesarean deliveries by a skilled veterinarian. They are vulnerable to fractures and other accidents in puppyhood. Some of the breed have a molera, an unclosed section of the skull which can remain open throughout life. This makes the dog prone to injury.