May National Puppy Day never end: Zac Efron, Channing Tatum and other stars' cutest photos

All great things must come to an end — yes, even National Puppy Day.

Thankfully, celebs across the country celebrated by posting pictures of their pets on social media on Monday, which will have to hold us over until the holiday rolls around again next March.

Check out some of our favorite Puppy Day pics from the stars.

Zac Efron

Channing Tatum

Betty White

Julianne Hough

Vanessa Hudgens

Marie Osmond

Allison Williams

Kate Upton

Ariana Grande

Kellan Lutz