Good Morning and welcome to Just answer. I am Dr. Loretta, a licensed veterinarian and I am happy to answer your question.
Yes, constipation can cause Tyson's anus to become red and swollen if he is straining. Try giving Tyson a dose of laxatone every 4 hrs to help ease this discomfort. This can be purchased at the pet store and works very well to help Tyson past this.
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Please let me know if you have ANY other questions. My goal is to give you 100% satisfaction and if you are not yet satisfied, please Reply so I can clarify for you
Sincerely, Dr. Loretta