Welcome... Bonez has bad staining ... Vet says it is allergies .. It can take up to 3 months to notice any changes. The people on this site are really helpful..some use witchazel, I have and noticed it lifts the colour.. . I also found out that last weekend plug in air fresheners made him really bad. The day after they were unplugged he was back to normal. Are you feeding grain free. Salmon oil is also good for the immune system and also apple cider vinegar in the drinking water. I am sure that you will get some more help.... It is a bit of a waiting game.