This has got to be the best dog trailer out there! Sturdy, well made, thick canvas fabric, solid metal frame. My border collie loves it, the mesh windows to get the breeze. I also use it to haul groceries. It has a lot of space. It IS heavy at 25 lbs. Plus 20 lbs of dog & I'm hauling 45 lbs. I have an E-bike. With a regular bike I'd only be able to haul it on flat, paved surfaces. The E-bike makes it a lot easier on slight grades.
Originally I bought the medium sized one (red one), but it was too big for my border collie. I exchanged it for the small & it's perfect. You may want to size down. (The medium or large is maybe 30+ lbs.) One thing -- you will have to inflate the tires. And wouldn't be good for bumpy trails.
The assembly instructions are hard to read. But, you'll figure it out. It is easy to switch it from a trailer to a stroller. Just change the arm & add the handle. I use it to stroll older or infirm dogs around the neighborhood. Great product! Great customer service.

Just got into riding my bike again and wanted a trailer so that I could bring my dogs along. I had previously purchased a larger Schwinn trailer that was made for kids, not furbabies. This one was half the price. I've taken it on a few rides, and so far I'm very happy with it. I have two dogs that are each about 16 pounds. They both fit in--although it is a tight squeeze. Thankfully they love each other LOL. I knew that going in, and it's fine for us, but wanted to give that perspective so you can better estimate the size.

Pros:

Sturdy material

Overall nice quality

Fairly easy to put together (despite HORRIBLE directions)

Sharp looking design that matches my bike

GREAT PRICE

Cons:

Directions are AWFUL and don't make much sense. You should put the wheels on last so the device isn't moving around when you're trying to set up the frame. No words. Picture quality is very bad.

Not a fan of this locking device for the arm. It holds well, but the design of it seems flawed. Like you can hit it just right and it would fall off. Think a screw would have worked better.

Flag is junky. It fell off during my first ride. Pennant is lame.

Front wheel is poor quality (plastic).

Very tricky to inflate tires. Should be a little bigger so that you can fit the nozzle in there better.

***

Overall, 4/5 stars. For the price, this is just awesome and I'm looking forward to spending more time with my dogs.

**update**

Taken it on several rides and is seeming to hold up. I purchased a mat for cushion that was designed for a kennel. Made a huge difference. My dogs absolutely love it.

I'm so glad I bought this for our little dog Myah. She's 15 lbs and tall and long; she fits in there perfect. Still enough room to lay down or stand up or turn around. we put a dog bed in the bottom for comfort and security. She always wants to be with mom and dad doing everything, so we wanted to start riding our bikes for exercise, so we thought she might like to go with us. She's only been out once so far but she was perfectly fine just sitting there and looking around, she was so cute. I'm looking forward to more trips with her, it's just been too hot and rainy lately. I definitely recommend this buy for a small dog that loves to travel and be with their parents! Very easy to assemble and just what we wanted. Great price

Bought this for our small dog for long walks or bike rides... He's so small that he gets wore out trying to keep up with us. So on asphalt walks or other easy hikes, we take this along. It was was built but hard to put together. Instructions were a bit hard to follow and the parts are not precise fit. I had to trip off a bit metal off one of the bars. But it fit perfect after that. It rolls well behind my bike and connects easy. It's great as a stand alone stroller as well and rolls smooth. Our dog loves it and is really good inside. He has plenty of air movement. Our little guy love is behind the bike. I am sure that you can use it for so much more.
Great purchase!

Absolutely love this! I bought this for 2 uses: 1. one of my dogs and I need a little more exercise than my skinny dog, this allows me to put the skinny one in after a short walk so the other one and I can walk longer and she call still enjoy it with us 2. So we can enjoy bike rides together.

So far this has been great for my first use. After a long enough walk with each dog I actually put them both in the stroller so I can walk longer. I haven't actually tried it as a bike trailer yet because my bike is being held hostage by wasps in the shed! I'm sure it will be great once I can though.

This stroller is also great for walking them up to the farmer's market. It keeps them contained so I don't have to worry and I can fit some small purchases in with them. I've also made a pouch to attach to the stroller for storage.

One surprise bonus use is that all my animals can enjoy it. I have to store it in the house (see wasps in shed) and have discovered the cat taking naps in it several times.

No idea if it's easy to break down for storage and transport but it was super easy to put together and only took me about 5 minutes.

Size wise: my dogs are 8 and 11 pounds and fit in together very comfortably, the fat cat is about 17 pounds.