Which Hamax Dog Trailer Is Right for My Dog?

Hamax Australia sells three dog trailers, sized by dog weight rather than breed. The Milou ($1,199.95) suits dogs up to 20 kg, the Pluto Medium ($1,399.95) suits dogs up to 35 kg, and the Pluto Large ($1,499.95) is rated to 40 kg while being towed by bike, rising to 45 kg in stroller mode. All three share a washable interior, adjustable suspension, and a lockable bike arm. The right size depends on your dog's actual weight, not its breed.

Key Takeaways

• Hamax Australia sells three dog trailers by weight, not breed: the Milou (up to 20 kg), the Pluto Medium (up to 35 kg), and the Pluto Large (up to 40 kg cycling, 45 kg stroller mode).
• All three share core features: adjustable suspension, a washable interior, a low step-in entry, and a lockable bike arm that stores inside the trailer.
• Both Pluto sizes include a stroller kit as standard. The Milou's stroller wheel is a separate $219.95 accessory.
• All three are tested and approved to EN15918, the relevant European safety standard for this category.
• Price scales with size: $1,199.95 for the Milou, $1,399.95 for the Medium, $1,499.95 for the Large.
• A dog trailer supplements but doesn't replace regular exercise for the dog.

What is the difference between the Milou, Pluto Medium and Pluto Large?

The main difference is size and dog weight capacity. The Milou is the smallest and lightest, built for small dogs up to 20 kg. The Pluto Medium and Pluto Large are larger, built for medium and large dogs, and share more features with each other than either does with the Milou, including side-opening mesh windows and a stroller kit included as standard.

Which Hamax dog trailer suits my dog's weight?

Milou, up to 20 kg

The Milou suits small dogs up to 20 kg, with a 63 x 35 x 47 cm interior and a trailer weight of 13.5 kg including the bike arm. It has front and rear openings rather than a side-opening window, a replaceable outer fabric, and an aluminium frame with a rollover protection bar. The stroller wheel is sold separately as the Milou Stroller Kit ($219.95), not included standard. Check current stock status on the product page. View the Milou.

Pluto Medium, up to 35 kg

The Pluto Medium suits dogs up to 35 kg, with a 78 x 46 x 67 cm interior and a trailer weight of 15 kg. It has front and rear low step-in entry and exit points, plus an openable mesh side window, useful for dogs that struggle to turn around, a front storage pocket, and a stroller kit with a height-adjustable handlebar included as standard. View the Pluto Medium.

Pluto Large, up to 40 kg cycling or 45 kg stroller mode

The Pluto Large suits larger dogs, rated to 40 kg combined dog-and-luggage weight while being towed by bike, rising to 45 kg when used in stroller mode. Its interior is 100 x 60 x 80 cm, and it weighs 18.8 kg including the bike arm. It opens from the front, rear and both sides for access, and shares the Medium's front pocket and included stroller kit, in a larger size. Check current stock status on the product page. View the Pluto Large.

Comparison: Milou vs Pluto Medium vs Pluto Large

Prices above are correct as of 15 October 2026 and are subject to change. Check each product page for current pricing before purchase.

Should I size by breed or by weight?

By weight, not breed. Hamax sizes its dog trailers by maximum dog weight, 20 kg for the Milou, 35 kg for the Pluto Medium, and 40 to 45 kg for the Pluto Large, rather than by breed category. Weigh your dog rather than guessing from breed alone, especially for mixed breeds or dogs at the upper end of a breed's typical weight range. See all three dog trailers side by side on the Dog Trailers page.

Does interior space matter beyond just weight?

Yes. A dog close to a trailer's weight limit may still be more comfortable in the next size up if it's a taller or longer-bodied breed. The Pluto Large's greater interior height (80 cm versus 67 cm) and length (100 cm versus 78 cm) give more room to lie down and turn around than the Medium, and the Medium in turn offers more room than the Milou's 63 x 35 x 47 cm interior.

What's included with each trailer?

Both Pluto sizes include a stroller kit with a height-adjustable handlebar as standard, so you can switch between bike and stroller mode without buying anything extra. The Milou doesn't: its stroller wheel is a separate accessory, the Milou Stroller Kit at $219.95. If stroller mode matters to you and your dog is Milou-sized, factor that into the comparison.

Who genuinely benefits from a dog trailer?

Puppies and young dogs not yet suited to long distances, and senior dogs with reduced mobility, are the clearest use cases across all three trailers. It's also a practical answer to a specific modern problem: e-bikes travel faster and further than most dogs can comfortably run alongside.

As general guidance, puppies under 12 weeks old should not use a dog trailer, and none of the three is designed for jogging, running or rollerblading, cycling and calm walks only.

What are Hamax Australia's shipping and safety considerations?

Hamax Australia ships Australia-wide, with in-stock orders dispatched within 1 to 3 business days. See the Shipping, Returns & Warranty policy for current shipping rates and thresholds. In hot weather, monitor the trailer's temperature and your dog's breathing, and bring water and take regular breaks, in line with RSPCA Australia's general heat-safety guidance for pets, see About Hamax or Contact Us for support.

Frequently Asked Questions

1. What size dog trailer do I need?

Weigh your dog and check it against each trailer's rating: 20 kg for the Milou, 35 kg for the Pluto Medium, or 40 kg cycling (45 kg stroller mode) for the Pluto Large. For taller or longer-bodied dogs near a weight limit, the next size up's greater interior room may be worth the extra cost.

2. What is the smallest Hamax dog trailer?

The Milou is Hamax Australia's smallest and lightest dog trailer, built for dogs up to 20 kg, with a 63 x 35 x 47 cm interior and a 13.5 kg trailer weight. Unlike the Pluto range, its stroller wheel is sold separately rather than included.

3. How much can the Pluto Large actually carry?

It depends on the mode. Hamax rates the Pluto Large to 40 kg combined dog-and-luggage weight while it's being towed by bike, rising to 45 kg when it's used in stroller mode rather than cycled. The Milou and Pluto Medium don't have this split; their ratings are the same in either mode.

4. Does a dog trailer replace regular exercise?

No. A dog trailer is a useful tool for transport, not a substitute for regular physical activity, which remains important for a dog's overall health regardless of how often the trailer is used.

5. Can the trailer be used for anything other than a dog?

Yes. Both Pluto sizes and the Milou also function as a general cargo trailer when not carrying a dog, given their low step-in design and interior space, useful for anyone wanting a dual-purpose trailer rather than a dog-only accessory.

6. Is a Hamax dog trailer safe for older or less mobile dogs?

Yes. The low step-in entry on all three trailers is specifically designed to make entry and exit easier for dogs with limited mobility, and Hamax names senior dogs as one of the clearest use cases alongside puppies not yet suited to long distances. For dogs with an injury, illness, or back or joint problems, consult a vet about using the trailer and the best lying position for the dog.