How to get weight on my dog?

If your dog had a choice what would it eat? If no humans were around to force feed dogs what would your dog eat? raw meat such as rabbit, rat, mole, chicken. That includes organs and bone too. You can actually buy chicken meat, bone, and organs for much less than all these supposed high quality dog foods. Feeding raw meat is not easy though. You can always mix it up. Feed dry food then give a chicken wing raw at night or morning or whenever convenient. Chicken bones are NOT dangerous to eat when raw. They become brittle and dangerous once cooked. You can also try different foods dry or raw to find what flavor your dog likes. The only bad thing with dry food is changing it often leads to poop problems such as runs, constipation, or stinky gas.

I had a dog who just couldnt put on weight. He is now 5 years old and almost chunky. He looks very good now. It was a mix of things that helped. Feeding him chicken raw plus dry food with blood from the meat poured on it, free feeding dry food without blood, and finding a dry food he liked best but worked well with his insides. Now that he is at good weight he free feeds a good dry food and gets one chicken 1/4 with bone each day. Any more and he buries and hides the chicken for later which gets nasty. He is now 172# and 32" at shoulder. Very happy boy and healthy too. Only buy dry food that has some type of meat listed as 1st ingredient. Dogs were never meant to be rice or corn eaters. That is simply crazy talk for companies to make big profit. Just like some coffee companies add potato or other grinds to coffee grounds. You would never drink potato coffee by choice but if you have drank coffee for years without discretion then you probably have. Same thing with dog food. No dog would choose to eat most brands and most ingredients.

You need a high quality kibble... Not shitty brands like pedigree, science diet and so on. The better the food the higher the cost but its well worth it. You feed less as they're getting more nutrients in each bite, they shed less, they smell less, they put on HEALTHY weight, they're more energetic, their skin is healthier, their coat is shinier...

Orijen is high in protein which can help... Acana, ziwipeak and nutrisca are other favorites. There's also blue wilderness, wellness core, taste of the wild, Merricks and Evo. All are grain, byproduct, and corn free and are meat based. Very good foods.

I also suggest giving an egg twice a week. Entire egg.. Shell and all. Either raw or very, very lightly poached. They're full of proteins and nutrients.

Also.. meaty bones. While they might not help a ton with weight gain, they will keep her teeth and gums extremely healthy. Just can't help but recommend them. And it has to be raw. Cooked may cause blockages and splinter as well. Beef ribs are my favorite, but lamb shanks work as well, or you can ask a local butcher or hunter for left overs... Rabbit, bison, beef, etc. etc.. Any things fine. But I'd avoid poultry. Poultry is fine for dogs to eat but too risky when the dog is kibble fed, IMO.

Science Diet isn't a great food. How about Performance by Pro Plan? It is for high energy working dogs. Also, adding canned food to the diet will help you put weight on.