Photo by Monica Ferro

Plan, book, travel with confidence
Better together
Save up to $2,000 when you book a flight and hotel together*
Find the right fit
With over 300,000 hotels worldwide, it's easy to create a perfect package
Rest easy
Plan, book, and manage your trip all in one place

Top Pet-friendly Grassy Key Hotels

Rainbow Bend Resort

57784 Overseas Hwy Marathon FL

22 min walk from Dolphin Research Center

Make it a pet-friendly trip and bring along your four-legged friend. Dogs are welcome (fees apply) at this oceanfront hotel.

8.2/10 Very Good! (1,002 reviews)

"When was clean, Property was clean and organized, staff was really sweet and helpful. Best part was the lounge chairs on the beach watching the sunset. Close to a lot of state parks which we really enjoyed. Overall we’ll be back."

Reviewed on Nov 7, 2026

Gulf View Waterfront Resort

58743 OVERSEAS HWY Marathon FL

4 min walk from Dolphin Research Center

Dogs and cats will approve of the pet-friendly amenities, such as a dog park, during their stay at this hotel (fees apply for pets).

Grassy Flats Resort & Beach Club

58182 Overseas Hwy Marathon FL

14 min walk from Dolphin Research Center

This pet-friendly, oceanfront hotel welcomes dogs for an additional fee. Nearby Sunset Park Beach is a good place to stretch your legs if you need a walk.

9.4/10 Exceptional! (504 reviews)

"Loved everything about this place!"

Reviewed on Nov 5, 2026

See all 2,338 properties in Grassy Key

Lowest nightly price found within the past 24 hours based on a 1 night stay for 2 adults. Prices and availability subject to change. Additional terms may apply.