Porpoise Warning Sign for Dock, Boathouse or Beach House

Highly Trained porpoise metal warning sign stating the property is protected and not responsible for injury or possible death

Porpoise metal warning sign with a bold WARNING header and the full injury or possible death disclaimer, front view

Funny coastal metal warning sign announcing that a highly trained porpoise protects the dock and property

Premium aluminum metal signs banner for the porpoise warning sign: UV protected, rustproof and weather resistant

Choose your finish: clean and distressed versions of the porpoise warning sign shown side by side

Highly Trained porpoise metal warning sign in classic safety style for a boathouse, beach house or waterfront deck

Size chart for the porpoise warning sign: 9x12, 12x18 and 16x24 inch rectangles

Mounting options for the porpoise warning sign, with pre-drilled holes or with no holes

Porpoise metal warning sign warning visitors the owner is not responsible for injury, ready for a dock post or piling

Square size chart for the porpoise warning sign: 6x6, 8x8 and 12x12 inches

Roll over image to zoom in Click on image to zoom

Dock owners, this porpoise warning sign is for you: a bold WARNING header announces the property is protected by a highly trained porpoise. Printed directly on rust proof aluminum with a UV coating, it stands up to rain, fog and salt air, and comes with or without holes for a piling or boathouse wall.

Can it hang outside on a dock in salt air? Yes. Aluminum can’t rust, and the UV coating helps the print hold its color in full sun. Rinse off salt spray with fresh water now and then.

Product Details

• Full sign text: “WARNING: This property is protected by a highly trained porpoise. Not responsible for injury or possible death.”
• Classic safety sign layout with a bold header that reads clearly from the end of the dock
• Printed directly on heavy gauge aluminum, so the image won’t peel or bubble like a decal
• UV protective coating helps the print resist fading in sun or strong light
• Rust proof aluminum that stands up to rain, fog and salt air, indoors and out
• Slightly rounded corners and a lightweight build

Size & Finish Options

• Rectangle sizes: 9x12, 12x18 and 16x24 inches
• Square sizes: 6x6, 8x8 and 12x12 inches
• Finishes: Clean, New Look for a modern beach house or Distressed, Wood Look that blends with weathered dock boards and cedar shingles
• Mounting: with or without pre-drilled holes, on every size
• Starting at $14.95

Packaging & Shipping

Every sign ships flat in a rigid fiberboard mailer or a heavy duty box to prevent bending. Orders are printed in Henniker, NH and leave the studio within 1 to 2 business days. Standard shipping by USPS Ground is free on US orders of $50 or more and $5.95 on smaller orders. Need it sooner? Choose USPS Priority Mail or Priority Mail Express at checkout. Every order includes tracking, and local customers can pick up at our Henniker studio.

Perfect For

Boaters, kayakers and families with a dock on a coastal cove where porpoises surface at dawn. It belongs with the nautical signs in a beach house or boathouse, and it is a good gift for the friend who corrects everyone who calls a porpoise a dolphin.

Made With Care

Every sign is made to order and handled with special care from printing to packing. Want different wording or a custom size? Email us and we’ll do our best to make it happen.

Complete Your Collection

Pair it with the Dolphin Coastal Warning Metal Sign, the Highly Trained Manatee Metal Sign, or the Hermit Crab Warning Metal Sign, and find more in our Aquatic & Marine Animal Signs.

What are your metal signs made from?

Our metal signs are printed directly onto heavy-duty aluminum (no decals or stickers involved), giving them a durable, rust-proof finish. Each sign is proudly made in the USA at our studio in Henniker, New Hampshire.

Are your metal signs suitable for outdoor use?

Yes! Our metal signs are designed to withstand outdoor elements and feature a UV protective coating, making them ideal for both indoor and outdoor display for years to come.

How do I hang my metal sign?

Most of our signs are available with pre-drilled mounting holes for easy hanging. If you'd prefer no holes, we offer that option as well – just select it when ordering.

How do I clean my metal sign?

Metal signs can be cleaned easily with a standard glass cleaner and a soft cloth to keep the print looking bright and clear.

Can I customize a metal sign with a specific vehicle, breed, or detail that isn't listed?

In many cases, yes! If your specific vehicle, pet breed, or detail isn't listed, choose the closest matching sign. If the product page has a customization field above the "Add to Cart" button, enter your details there and we'll personalize it for you. If there's no customization field on that listing, email us with your details and we'll let you know if we can accommodate your request.

What size metal sign should I choose?

For most walls, a 9x12 in or 12x18 in sign works well as a focal point, while 16x24 in and larger suit bigger walls or garage doors. Smaller 6x6 in or 8x8 in sizes are popular for mailboxes, gates, or gift-sized pieces — check the size chart on each listing for exact placement guidance.

How long do metal signs last outdoors?

With their UV-protective coating and rustproof aluminum construction, our signs are built to stay vibrant outdoors for years through sun, rain, and snow without fading, cracking, or rusting.

Highly Trained Porpoise Warning Sign

Harbor Patrol for the Dock and Boathouse

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