Yes, most offerings have at least two sizes for their products. The majority of them come in small or medium sizes, which will accommodate most dogs that want to ride in the car. If you have ever noticed, it is usually the owners of small or tiny dogs that bring them for rides the most. They are easier to handle and are more apt to cuddle and behave than larger dogs. These are the dogs that are more likely to have a dog bed in the house and be used to having a certain amount of space to be in. Car seats for these smaller or medium-sized dogs are therefore offered more often than for the larger breeds.