Most chihuahuas are considered full grown by the time they are one year old. The typical chihuahua puppy will be near its adult size when it reaches six months old. More »

Chihuahuas can mate as soon as they are sexually active, but a responsible breeder will wait to start breeding his or her Chihuahuas until they have reached full sexual maturity at 12 to 15 months for males and 6 to 18 m... More »

The average litter size of a Chihuahua is between one and three puppies. Theoretically, a Chihuahua can have two litters of puppies a year for a period of 13 to 17 years. More »

The first rabies vaccination given to a dog at around four to six months of age lasts for one year, at which time the dog requires a booster rabies vaccination. The second round of rabies vaccinations and all subsequent ... More »

Chihuahuas generally finish growing between 9 and 12 months old. Like many small dogs, Chihuahuas grow quickly in their first 12 weeks of life, after which time their growth gradually slows. More »

The modern short-haired Chihuahua originated in Chihuahua, Mexico, in the 1850s. The breed's ancient origins are debated, but historians believe Chihuahuas were first discovered in Mexico, Central America or South Americ... More »

According to the American Kennel Club, Chihuahuas are a small, intelligent breed of dog notable for their large ears and expressive eyes. Chihuahuas are named after the Mexican state in which they were first found. Some ... More »