Hi there. I have a 130lb Dane/Mastiff Mix named Wrigley who is 5.5 years old.  She was just diagnosed with osteosarcoma.  We are a young family and relatively active and Wrig is used to long walks and hiking.  We decided to go with amputation and chemo and have come to terms with that--surgery is scheduled for Tuesday.  I wanted to get some sort of wagon for when she gets tired so she can still enjoy time outside with us and some level of activity.  I know she will adjust to 3 legs but from what I can tell it takes a lot more energy to get around and especially with the chemo she likely won't have the stamina she used to.  I bought a radio flyer 3 in 1 wagon with all road tires to see if she could ride in it but honestly it is just a bit too small.  All of the pet wagons and strollers seem even smaller than that and most have a closed in top which would really make her cramped inside.  I just wanted to see if anyone with a giant breed dog has used a wagon and if so, could recommend it?  Thank you so much!