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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.

8/10 Very Good! (811 reviews)

Clean room. Awesome location . Pool with hot tub open pretty much all hours. Breakfast with view. Definitely coming back here again.

Reviewed on Jan 14, 2026

Grassy Flats Resort & Beach Club

58182 Overseas Hwy Marathon FL

14 min walk from Dolphin Research Center

This hotel is pet-friendly, allowing dogs with an additional fee. If you're going for a walk during your stay, swing by nearby Sunset Park Beach.

9.4/10 Exceptional! (372 reviews)

Beautiful room and grounds. Everything was clean and well cared for. Staff was friendly and attentive. The views were glorious!

Reviewed on Jan 10, 2026

Gulf View Waterfront Resort

58743 OVERSEAS HWY Marathon FL

4 min walk from Dolphin Research Center

Dogs and cats are welcome (fees apply) at this pet-friendly hotel offering pet-approved amenities, like a dog park. For a walk during your stay, seek out nearby ...

8.4/10 Very Good! (536 reviews)

Absolutely spectacular room 24

Reviewed on Jan 11, 2026

See all 2,287 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.