Hi Marty –
Calcium and phosphorus levels are really only a concern for joint health during the growth phase. Once large/giant breed dogs reach two years of age their joints are fully developed and at this point they’re either dysplastic or not dysplastic. Calcium and phosphorus levels obviously need to be in balance with each other (between a 1:1 and 2:1 ratio of C:P) but this is true for all dogs, not just large/giant breeds, and isn’t a concern as long as you’re feeding a balanced commercial food (where balancing C:P ratios come into play are with homemade diets). I personally feel that a diet high in protein, moderate in fat and low in carbohydrates is healthiest and most species-appropriate for healthy dogs. My three bloodhounds eat between 45% and 55% protein, 30% and 40% fat and <15% carbohydrates at each meal. If feeding a dry food, I would search for one with no less than 30% protein. I also would not limit yourself to only one brand – variety is important. I no longer feed dry dog food, but when I did I switched brands and protein sources at the end of every bag and I added different canned and/or fresh food toppers daily. I would recommend finding a minimum of three foods your dogs can eat (preferably different brands with different protein sources). Patty had a wonderful suggestion with online ordering if selection is limited where you live – some other sites that have a big selection and offer free shipping in addition to the two she posted are Wag.com, Doggiefood.com and NaturalK9Supplies.com. There are several supplements you can give your dogs that help to promote joint health and/or have anti-inflammatory properties. If your dogs don’t have any orthopedic conditions or arthritis a basic glucosamine, chondroitin, MSM supplement would be fine to start off with. Some other supplements good for joint maintenance are hyaluronic acid and esterfied fatty acids (like cetyl myristoleate). Some whole food supplements that are beneficial for the joints are eggshell membrane, velvet elk antler, sea cucumber, green lipped mussel and shark cartilage. Raw meaty bones (especially those high in cartilage such as trachea, chicken feet and gullets) are very rich in naturally occurring chondroitin. For dogs experiencing pain/arthritis some natural anti-inflammatories include high doses of omega 3 fatty acids (up to 300 mg. per 10 lbs.), turmeric, boswellia, tart cherry, yucca, bromelian and white willow. Generally human supplements are cheaper and higher quality than supplements marketed to dogs, adjust the dosage accordingly (a good rule of thumb is a 25 lb. dog would get about 1/4 of the recommended human dose, 1/2 the human dose for a 50 lb. dog, 3/4 the human dose for a 75 lb. dog and full human dose for dogs >100 lbs.). Also – as you may already know – the most important factor to maintaining healthy joints and staving off arthritis in large and giant breed dogs is maintaining a healthy body weight, it’s very important that large/giant breeds don’t become overweight as this adds a lot of stress to the joints.
