Straight Line Design is a creative design studio created unusual furniture and life object. Just like the cartoon-like kids furniture they made, they just crafted a brand new series called âPet Trailersâ. Made from environmentally-friendly materials like recyclable aluminium Stainless Steel and fiberglass, it includes four unique, dog-sized trailers which is fully customizable. So if you are going out for camp and want to take your dog with you. You might want to give them a separate trailer? However, this cute pet trailer is pretty pricey – start at $1000.00 each.