While It Isn't Known How Long a Dog's Memory Lasts, It Seems That They Do Remember Loved Ones and Their Companions for Some Time. Depending on the Dog, This...
While it isn't known how long a dog's memory lasts, it seems that they do remember loved ones and their companions for some time. Depending on the dog, this can last days, weeks or months. Most dogs will, with time, return to their normal selves, so it's important to be patient.
How long does it take for dogs to forget other dogs?
A study published in the November 2016 edition of Animals found that canine grieving behaviors — and how long they last — can vary from dog to dog, according to Dr. Jennifer Coates, DVM, an advisor for Pup Life Today. “Typically, their behavior returned to normal within two to six months.”
Dogs also can have associative memories of experiences with other dogs. If they play together and have positive experiences, a dog can associate the experience with that specific other dog and remember them. Just as with humans remembering other people, context plays a role in dog memory.