When it comes to pet pillows for large dogs, you'll want to look for something comfortable, supportive, and durable. The best options will be made of a thick, sturdy material like memory foam which will provide excellent cushioning and support. You'll also want to be sure to choose a pillow that is large enough to provide enough space for your dog to get comfortable. Additionally, look for pet pillows that are made with removable and washable covers for easy cleaning.