Will 2 cats who used to live together remember each other after being apart for 3 months?

It's possible, but not guaranteed. Here's why:

Factors that increase the likelihood of remembering:

* Strong bond: Cats who had a very close relationship before separation are more likely to recognize each other.

* Shared routines: Cats who shared routines, like eating together or playing together, might have stronger memories associated with each other.

* Scent: Cats have a strong sense of smell, and they rely heavily on scent for recognition. If their scents are still familiar, they might be able to recall each other.

* Individual cat personality: Some cats have better memories than others.

Factors that decrease the likelihood of remembering:

* Length of separation: 3 months is a significant amount of time, and memories can fade.

* Age of cats: Older cats might have more difficulty remembering.

* Changes in environment: If either cat has experienced significant changes in their environment, it could affect their ability to recognize the other.

How to help them remember:

* Gradual reintroduction: Don't rush the reunion. Introduce them in a neutral area with controlled interactions.

* Familiar scents: Use toys or blankets that smell like the other cat to help them remember.

* Patience: Give them time to adjust and remember each other. Don't force interactions.

It's important to remember: Even if they don't immediately remember each other, it's likely they will eventually re-bond with time and patience.