Retractor muscle

[mphsthweatts@juno.com]

Hey folks,
Here's a question/ situation I would like ya's opinion on.  My horse
experienced a penile edema this past winter, during our coldest week.  We
dealt with frost bite and infection and he recovered but if I ride over 2
hours he starts letting it hang.  I noticed that that is a symptom of
exhaustion but other than that he's fine.  Is that one symptom enough to
get him pulled when we start competing?  Should I bring a letter from my
vet explaining that the muscle and/or ligament may still be recovering? 
The vet did say it would take awhile for it to completely recover and
that the more I ride the better.

Appreciate any comments,
Thanks,
Lynette 
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