Only you can make that choice. My vets have always tried to do everything before going there. You may need a referral to a specialist to get to the bottom of this. Unfortunately it often comes down to cost for many people, but we all know you will always do your best for him. I am glad he is resting. Know you have friends holding you in our thoughts and supporting you, even if we are far away!
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First time Chihuahua owner with many years of dog experience!