Here's a rough estimate for a 4-month-old Pitbull:
* First year: Dogs age much faster in their first year, roughly equivalent to 15 human years for every year of their life. So, a 4-month-old Pitbull would be about 5 human years old (4 months = 1/3 year, so 1/3 * 15 = 5).
However, this is just a general guideline. Every dog is different, and the actual age in "dog years" can be affected by factors like breed, health, and lifestyle.
For a more accurate estimate, consult your veterinarian, who can provide personalized advice based on your dog's specific characteristics.