What is the best practice when introducing a new pet into a household?

Gradual, supervised introductions are the best practice when introducing a new pet into a household because it allows both the new and existing pets to acclimate to each other's presence in a controlled manner. This approach minimizes stress and reduces the chance of aggressive encounters or territorial disputes. By supervising their interactions, you can monitor their body language and behavior, allowing you to intervene if either animal shows signs of stress or aggression.

This method also allows for a more positive association between the pets, as they can become accustomed to each other's scents and presence without overwhelming each other. The gradual process can include short, positive interactions that increase in length over time, which ultimately leads to a more harmonious household.

The other options present potential issues: immediate introductions without supervision can lead to fights or fear-induced behaviors, separation for a week might not allow the animals to properly adjust to each other, and while pheromone diffusers can help reduce stress, they do not substitute for the important socialization and acclimatization process. Thus, gradual and supervised introductions are key to ensuring a smoother transition for everyone in the household.