Physical Development:
* Near full size: Chihuahuas generally reach their adult size by 9-12 months, though they might still be filling out a little.
* Adult coat: Their puppy coat may start to give way to their adult coat, which can vary significantly in texture and length depending on the breed type (smooth coat, long coat, etc.).
* Hormonal changes: Females may go through their first heat cycle (estrus) around this age, which can last for about two weeks.
Behavioral Development:
* More confident and independent: They become less reliant on their humans and may show more independence.
* Testing boundaries: This age is a common time for testing limits and pushing boundaries. They may be more playful and energetic, but also more prone to mischief and stubbornness.
* Developing adult personality: You may start to see more of their mature personality traits, like whether they are more outgoing, shy, or playful.
* Potentially more protective: Female Chihuahuas, especially, can be quite protective of their owners and their territory. This instinct may become stronger during this phase.
Health:
* Ongoing vaccinations: Vaccinations should be kept up to date, including the rabies vaccine.
* Spay considerations: If you are not planning to breed your Chihuahua, spaying can help prevent uterine infections and mammary tumors, among other health benefits.
* Dental care: Dental hygiene becomes increasingly important. Brush their teeth regularly and schedule professional cleanings if needed.
General Tips:
* Training and socialization: Continue training and socializing your Chihuahua to ensure good behavior and positive interactions.
* Exercise and mental stimulation: Provide them with plenty of exercise and mental stimulation through interactive play, puzzles, or training sessions.
* Vet checkups: Regular vet checkups are essential to monitor their health and catch any potential issues early on.
Remember that: Every Chihuahua is different, and their development may vary slightly. If you have any concerns about your dog's behavior or health, consult your veterinarian.