Even though pet strollers can say they work for a certain range of animal (pound wise) you may find that a 15 pound dog fits much better in a medium size stroller, even though the small size may be rated to 20 pounds.
You want to make sure your pet is going to feel comfortable in the pet stroller, which means he has enough room and is not cramped. Feeling cramped may lead your dog to not want to stay in the pet stroller and try to get out or claw at that sides.
I would suggest using the Walk ‘n Roll Pet Stroller for smaller even tea cup dogs, and go for a medium to large size stroller for medium to larger size dogs.
The Happy Trails Pet Stroller is great for dogs between 15 and 20 pounds.
The Jeep Rubicon is perfect for large dogs or animals up to 60 pounds.
