If there is something in Missing Link that your dog is allergic to, they will itch. You can try cutting back the amount but it may not work, your dog may still itch.
I tried Missing Link many years ago, didn't agree with my Yorkies I had at that time at all and never tried it since.
For arthritis problems, you might check out Glucosamine supplements. You can ask your Vet about dosages for small dogs.
Some senior dog foods have it as an added ingredient. |