Bless you for taking such awesome care of your fur baby that he has reached 20! That is AWESOME!
I am sorry Squeek has sores uner her chin. It could be acne or miliary dermatitis.Both are allergic reactions.
You can apply raw honey to any sore or irritated areas. It is a remarkable healing agent:
In addition, add one quarter of a 4 mg chlortrimeten to a tablespoon of baby food chicken or turkey with no onion or garlic.
Give it every 24 hours. It is very tiny so he will not detect it
Please let me know how he is doing.
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