WASHINGTON -- There are two new residents at the United States Naval Observatory Monday, where the vice president's residence is, and both of them have four legs.

Harley, a new puppy, and Hazel, a new kitten, both flew on Air Force Two with the Pence family to Washington on Sunday. The family was returning from a weekend in Indianapolis. Both Harley and Hazel hail from Indiana.

Second lady Karen Pence and the Pence children surprised the vice president on Father's Day with Harley, an Australian Shepherd. Harley was born on St. Patrick's Day earlier this year.

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Mrs. Pence obtained Hazel for herself. Hazel is a gray kitten, born on April Fool's Day.

Mrs. Pence announced the family's new pets on Twitter Sunday. Here's Hazel:

We welcomed a new kitten to our family during our trip back home to Indiana this weekend!Introducing: Hazel! pic.twitter.com/TWk6WeUQi6 — Karen Pence (@SecondLady) June 18, 2017

And this is Harley:

And... for Father's Day, we surprised @VP with an Indiana puppy! Introducing: Harley! pic.twitter.com/ZlvNasOw9b — Karen Pence (@SecondLady) June 18, 2017

The Pence family's cat, Oreo, passed away recently, and their beagle, Maverick, passed away last fall.

Charlotte Pence, the Vice President's oldest daughter, posted an Instagram about the new pets that referenced the paid homage to Oreo and Maverick.

~ and with loss, comes new life ~ Welcome to our family, Harley and Hazel! And happy Father's Day to the best dad who deserves a surprise puppy and so much more. A post shared by Charlotte Rose Pence (@charlotterosepence) on Jun 18, 2017 at 12:25pm PDT

The Pence family's collection of animals now includes Harley, Hazel, another cat named Pickle; Marlon Bundo, a rabbit; and a recently added Naval Observatory beehive.