Start by assessing your dog's daily energy needs based on age, weight, and activity, then choose a product labeled for dogs or approved by a veterinarian. If you see a high calorie supplement marketed for humans, such as Optimum Nutrition Serious Mass, talk to your vet before giving it to your dog. For dog-specific options, look for trusted pet brands that formulate complete nutrition, and verify the label covers calories, protein, and fat per serving.

Start by checking calories per serving and the protein, fat, and carbohydrate breakdown. For senior dogs, prioritize high-quality animal protein sources and easily digestible fats, with limited fillers and added fiber for digestion. Avoid products with artificial sweeteners like xylitol and choose those labeled for canine use or vet-approved. If you see human products in your options, remember they are not canine-specific and require veterinary guidance.

For beginners, select a straightforward, dog-formulated option with clear feeding instructions and veterinary approval. A seasoned caregiver can tailor the dosage and timing, such as mixing into meals, while closely monitoring weight and health under veterinary supervision.

Introduce the supplement gradually by mixing it into meals to minimize stomach upset and follow storage guidelines in a cool, dry place. Monitor your dog for signs of intolerance and adjust the amount as directed by your veterinarian. Keep all products out of reach and avoid combining with foods or substances that are unsafe for dogs, like chocolate or grapes.

Look for dog-specific products from established pet nutrition brands like Hill's, Royal Canin, or Zesty Paws, which offer high-calorie options for seniors. If a human product such as Optimum Nutrition Serious Mass appears in your choices, remember it is not canine-specific and should only be used under veterinary guidance. Choose items with clear per-serving calories and macronutrient details and ensure they are labeled for canine use.