Final answer:
Permanent canine and premolar teeth in dogs generally erupt at about 4-7 months of age, with some individual variability.
Step-by-step explanation:
The permanent canine and premolar teeth in dogs typically erupt at 4-7 months of age. Specifically, canines generally emerge first, usually coming in between 4-6 months, after which the premolars follow, erupting usually between 4-7 months. It is important to note that there can be individual variability in the timing of tooth eruption among dogs, but the range provided is commonly observed in the majority of dogs.