April 11 is National Pet Day, and to celebrate, we're highlighting some of our readers' beloved animal companions with a gallery of reader-submitted photos. We receive so many wonderful pet photos every day, but these are the ones that stood out; they showcase incredible photography, adorable pets and amazing stories. We hope you enjoy the photos and that you take time to celebrate your pets — and all pets! — today.

It's hard to resist Boston Terrier Matilda's happy, smiling personality.

Bodhi, a playful Labrador Retriever, enjoys an afternoon at his local dog park during wildflower season.

Even when there's snow on the ground, Diego, a Doberman Pinscher, loves living near the beach.

Max, a Domestic Shorthair, naps peacefully near some spring flowers. His owner refers to him as "living yard art."

Sammy, a Lhasa Apso, plays in a tunnel at his local dog park. 

Rescued yellow Labrador Retriever Jasper looks dashing in his red bandanna.

Mia, a Turkish Angora, reflects as she watches the birds and squirrels outside.

At 4 pounds, Makenna may be a small Yorkshire Terrier, but she makes a big difference. She is a therapy dog and enjoys making people feel better!

This Maine Coon, Nala, is a therapy cat who brings cheer to patients and staff alike when she visits nursing homes.

Maverick, a Pit Bull-Greyhound mix, looks extremely handsome all dressed up in his sweater and bowtie.

Nicoya, a Labrador Retriever, takes a break while hiking up Rocky Peak.

Nero is a stealthy Savannah, ready to pounce.

This Australian Cattle Dog, Little Bit, loves attention and treats — no wonder she's such a good model!

Sanders, a German Shorthaired Pointer, pauses for a picture during a hike at Makoshika State Park.

With her mesmerizing eyes, Kittywampus the gray tabby cat looks like a feline supermodel.