Itās sad to hear this news about your small dog. My dog was also suffering from the same problem due to a lack of proteins he lost too much weight because of not getting a good diet. Then my friend recommended me to try a diet available at a store named bonne et filou then I bought their diet and after using it for a month I have seen a good improvement in my dog he has grown and increased his weight and become active as well. I would suggest you try their diet maybe you would also get the same result as I have got till now. Here is the link to the store kindly go through it.
https://www.reecoupons.com/view/bonne-et-filou
