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As they age, this breed can run a high incidence of hypothyroidism which can cause thinning of hair, reduced immune system, increase water drinking, and wt gain.
Pink itchy skin can indicate yeast...it also can cause an off white scale and a sweet smell.
I would recommend washing the dog in SelsunBlue shampoo (nothing else) and then try to get her thyroid checked.
Great! You can start Omega Fatty Acids (fish oil) supplements for skin health.
Hypothyroidism doesn't so much cause joint pain, but can cause muscle weakness.
In any case the fish oils or DermCaps from a vet help with the turn over and excess shedding of fur as well.
Free post is something we hit so that you don't feel you are "PAYING" for it. It is how we respond when it is not the "answer" to your question...or if we have questions.
There is not currently any other vets responding...at least for the last month or so. There are other specialist that you can ask for a reply from...if you would like their opinion too. Sometimes this is such a busy site, we don't usually give multiple opinions, but I can definately notify a few people if you want there input as well.