Dog is a pure optimist who holds out hope that today might be the day Sensei shares her snacks with him...

After a rough day at work, Sensei is cheered up when Dog shoves a ball in her face. Even Cat shows concern for her in his own way.

While taking Cat to the vet via taxi, Sensei listens as the driver tells her about the cat he used to have.

Sensei recalls what Dog and Cat were like when they were little.

Dog once managed to spill the container his food is kept in, and he still tries to knock it over every day, optimistically hoping it will spill again. Cat, on the other hand, doesn't wait around for happy accidents.

Dog gets so excited by all the attention he gets at the vet's office, he doesn't even realize he's been given a shot. Cat, however, is less excitable...

When Dog breaks free while on a walk, all Sensei has to do to bring him back is sing and dance. Cat, however, is not so easily lured in...

Sensei has no trouble understanding Dog's love of being petted. With Cat, it's all in the ears.

Sensei has been trying out a new game with her dog and cat lately, and their reactions are quite different...

Sensei recalls the dog she had as a child and reflects on how every pet has its own unique personality.

Sensei recalls how her cat reacted to her previous dog and does a little research into what his past behavior meant...

Sensei recalls the days when she volunteered at a dog shelter... which happened to take in cats sometimes, too.

Dog and Cat express their emotions in very different ways when Sensei returns home after being away for long periods.

Dog and Cat celebrate their birthdays in slightly different ways...

Sensei reflects on Dog and Cat's advancing ages and hears a shocking story from her dog-loving friend.

Dog and Cat have very different reactions when it's time to see the vet.

Dog is excited to be taking a new and unfamiliar route while out on a walk, but when he realizes what the destination is...

Dog and Cat both get some medicine, but administering it is not as easy as the vet makes it sound...

Sensei recalls the time when her childhood dog became a mother.

Sensei tries out some new grooming brushes for Dog and Cat.

Sensei recalls an odd childhood habit she picked up when dining out with her family: she would secretly take the bones from her lamb roast home to give to the family dog.

Dogs are notoriously light sleepers, which means you have to be careful about the noises you make...

Sensei's mother reads the first volume of the Dog and Cat manga, and it prompts her to reflect on how much Dog and Cat have aged since it was written.