I agree with what Ana said. I have a Great Dane as well so I understand the challenge that feeding a giant breed can be sometimes. I would avoid the hot dogs too. I only use hot dogs (good quality, all meat, all natural) for very special rewards. It’s not something you want to feed all the time.
My Dane was always slightly overweight on kibble no matter what brand I fed or how much I reduced his portion. The best thing I ever did for his health was switch him to The Honest Kitchen and raw. THK is a dehydrated food. You add water and let it rehydrate before serving it. It would be great for traveling in your motorhome with. You can incorporate some raw food instead of hot dogs if the concept of raw doesn’t bother you. There are a number of high quality raw frozen foods out there. I like Primal and Stella & Chewy’s the best. I started making my own homemade raw food because it was cheaper for me.
If you want to feed kibble, definitely check out the 4 and 5 star rated kibbles on this site. Everybody has their preferences. A few I like and have fed my Dane are: Earthborn Holistic, Annamaet Grain Free, Go! Fit & Free, Acana Regionals (Grain Free), and Orijen. Others I like are Horizon Legacy, Dr. Tim’s, and Victor. I would feed the 7 month old a food from Hound Dog Mom’s list of foods that are appropriate for a large breed puppy: https://docs.google.com/file/d/0BwApI_dhlbnFTXhUdi1KazFzSUk/edit All of these foods are 4 or 5 stars and have the appropriate amount of calcium for a growing large breed puppy.
Good luck and have fun with your newly adopted pups!
