I own an 80 lb German Shepherd! :-)
I have experience with dogs of all ages and sizes. I grew up with both a 50 lb mixed breed and a 10 lb beagle, both as puppies to old age. I own an 80 lb German Shepherd rescue who is 9.5 years old. She used to love to run until she tore her ACL so I'm happy to run with your dog if that's what he/she prefers! She is dog aggressive so ...