Hi Linda - Welcome to JustAnswer! I am a licensed veterinarian and would be glad to help!
Is there any discomfort when lifting the tail?
A problem defecating / straining to defecate?
Licking at the rear end?
No discomfort with his tail. No problem defecating/no straining either. He does like at his rear end, but does not exhibit any pain.
A neurological or orthopedic problem seems less likely as he can run normal from your description
What would be common from experience would be rear end, notably anal sac discomfort.
I never even thought of that. He had his anal sac checked a few months ago, but I'll have it checked again as soon as I can make an appointment for him. I think you have discovered what is going on. Thank you so much.
You are very welcome!
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I have saved your page and will not hesitate to email you if something comes up. Thanks again.