| Age | Significant Development |
Development Period |
Growth Period |
Approximate Weight (lbs.) |
| Birth | Neonatal | Maximal growth | 0.5 - 1.0 | |
| 11 - 15 days | Eyes open | Transition | 3.5 | |
| 20 days | Hearing begins | Period of Socialization |
7.0 | |
| 21 days | First emergence from den |
|||
| 35 days | Weaning | 13.0 | ||
| 8 - 10 weeks | Pups abandon den & live in temporary rendezvous sites |
15.0-22.0 | ||
| 11 weeks | Juvenile | 20.0-30.0 | ||
| 14 weeks | Rapid growth | 25.0-45.0 | ||
| 16 - 26 weeks | Milk teeth replaced; winter pelage becomes apparent |
28.0-70.0 | ||
| 27 - 32 weeks | Pups travel with the pack |
Slow growth | 30.0-80.0 | |
| 1 year | Epiphyseal cartilage closes |
End of bone growth | 60.0-100.0 | |
| 22 months | Sexual maturity | Adulthood |