I am by no means a canine nutritionist, merely someone who has put a bit of thought into what I feed mine. My knowledge is not specific to the medical condition and sensitivity of your dog. The guidelines that I found with a superficial online search for cardiac diet were:
– Provide your pet a high-quality natural meat-based diet with at least 25-30% protein (DM basis)
– Make sure your pet LIKES the food so that (s)he consumes enough calories to maintain BMI
– Mild to moderate sodium restriction (severe restriction in advanced cases)
– Supplements: omega 3 fatty acids, taurine, carnitine, B vitamins and Magnesium.
http://www.1800petmeds.com/education/diet-tips-pet-heart-disease-32.htm
I am going to assume that you are looking for a dry kibble based on your previous food choice. I feel that the top of the line dry kibble RIGHT NOW is Orijen. However, it does retail for $80/35lb. As I feed about 400 lb of dog, the budgetary compromise at my house is Merrick Grain Free at roughly $50/35lb.
Prior to Merrick Grain Free, I was feeding Taste of the Wild, but have decided that I prefer Merrick for not entirely nutrition-based reasons. While the protein content is slightly higher and the starch from sweet potato (rather than white), they are reasonably equivalent foods (in nutrition and price). However, Merrick uses all US-sourced ingredients (nothing from China). This is a political issue and safety concern of mine. The larger scale pet recall in 2007 due to melamine contamination was traced to Chinese product, and the more recent Petco recall of stainless steel bowls manufactured with radioactive Cobalt-60 scrap was most likely (while never publicly disclosed) of Chinese origin. Merrick also happens to be manufactured in Texas, where I live. Those variables may not factor into your decision at all, but are important to me.
I could not find a cardiac specific diet offered by Hill’s in their Science Diet or Prescription Diet lines and based my quick comparison on the Adult Advanced Fitness formula. The Advanced Mobility contained more Omega 3’s and Magnesium, but was lower in protein and higher in sodium. Orijen appears to be the best choice, but may not be an option for you dependent on your personal budget. Merrick Grain Free is my compromise, but is based on a few tertiary considerations that may not matter to you. I will be interested to hear what other posters have to contribute. (The following information was retrieved from those companies’ official website product pages and is as vague or detailed as they provided.) The summary comparison is this:
Hill’s Merrick Orijen
Protein 24.2 38 38
Fat 16.4 17 17
Carbohydrate 51.5 ? 25
Sodium 0.32 ? 0.4
Omega-3 Fatty Acids 0.67 0.4 1.1
Omega-6 Fatty Acids 3.33 4.8 3.0
Taurine (yes) ? 0.35
Carnitine ? ? ?
B Vitamins
B1 – Thiamine (yes) (yes) 0.9 mg/kg or 50 mg/kg?
B2 – Riboflavin ? (yes) 45 mg/kg
B3 – Niacin (yes) (yes) 450 mg/kg
B5 – Pantothenic Acid ? (yes) 50 mg/kg
B6 – Pyridoxine ? (yes) 38 mg/kg
B7 – Biotin ? (yes) 1 mg/kg
B9 – Folic Acid (yes) (yes) 5.2 mg/kg
B12 – Cobalamins (yes) (yes) 50 mg/kg
Magnesium 0.099 ? 0.1
Since the foods that I mentioned are simply those that I am familiar with and not anything that I originally researched with cardiac issues in mind, I would recommend that you use this as a springboard for your own research. Maybe there is a better option in Innova EVO, Artemis, etc. Finish out a chart similar to that above on each of the brands that this website lists as top-tier choices. Feel free to call companies like Merrick or Hill’s to ask about specific quantities of items on their ingredients list, but not in their analysis (like B vitamins).
You might also want to consult with a veterinarian that specializes in cardiac issues regarding dietary recommendations and possible supplements. Maybe it is more cost-effective or bioavailable to top-dress your pets dinner with certain vitamins (L-carnitine perhaps). As wonderful as your veterinarian my be, my experience is that the time constraints of their day-to-day rigamarole does not allow time for general practitioners to be current and thorough on more specific issues. Reading journal articles falls to the wayside. Specialist consultation and personal research are important any time you have a specific veterinary/medical diagnosis of concern. Your vet has to have a working knowledge of EVERYTHING. You can concentrate on the single issue that is of prominent importance for your pet.
Good Luck
