Why is my senior chihuahua's fur yellow on her hindquarters and tail?

The auburn color to her fur is most likely salivary staining. So even if you don't see her licking she most likely is at night or when you are not home. This may be allergy related. I would call your veterinarian and discuss allergies. There are many different options from anti-histamines to daily medications (Apoquel) to monthly injections (Cytopoint). Thank you for using Petco Pet Education Center, formerly Petcoach.

She could have a problem with her anal glands an need them expressed or she could have a problem with her back and/or tail causing some pain. It would be a good idea to have your vet take a look at her to determine the cause and treat. She may just need her glands expressed or she may need a pain medication and/or anti-inflammatory. She could have some arthritis causing discomfort.

Hello, my name is Dr. Shines and I am happy to help. If Pico isn't itching or licking the area, if the skin's not red or scabby and if the fur looks normal, this is probably normal. As they age, the skin can darken, particularly in the groin and armpits. If Pico seems to be scratching or licking more, or if you sees signs of infection, then make an appointment to have him examined. Allergies can cause the skin to darker as well. I hope this helps and please feel free to reach out any time.

Thanks for using Petco Pet Education Center, formerly Petcoach! It is hard to see in those pictures. That really requires an examination. That could be due to a skin infection or possibly just a normal pigmentation change. I would recommend that if this continues, you have her evaluated by a veterinarian for further assessment. Best of luck!

Poor Kiko! Jaundice is usually by either liver dysfunction or destruction of red blood cells. The doctor will run some blood work to determine which is present and then determine appropriate treatment. You are doing the right thing by having her seen quickly. Best of luck and please feel free to post any additional questions.

Poor Tiny. Without seeing him, I cannot say for sure why his fur is changing colors or why he has a poor appetite. His fur could be changing due to age or chronic chewing/licking. If he has a skin infection or thyroid problems, this could also cause his fur to change. There are a number of reason than can cause them to have a decreased appetite. I would have your vet take a look to ensure there isn't something that needs treatment for both the skin and appetite. If he has always been a picky eater then I would be less concerned. Some of these guys prefer to have homecooked meals which is fine as long as you feed them a proper and balanced diet. I would look into recipes off balanceit.com. I hope this helps!

Without a physical exam it is difficult to say but possibilities include infection, dirt or dry skin. Wash her using a pet approved shampoo. Monitor for redness, itchiness or odor. If it doesn't resolve, see your vet for an exam.