Aspirin for Horses

["guest@endurance.net" <guest@endurance.net>]

Danielle McNeil danielle_mcneil@yahoo.com
Hi... major lurker here,

Does anyone know how much aspirin should be given to a healthy, old (27 years old)
horse for pain relief prior to shoeing?  She's appears sound and painfree
whenever I ride her, but as soon as that hindleg has to get lifted high 
for a trim, she's in a lot of pain.  She's not an endurance horse or competing... 
I just want to make the every-8-week trimming process a less painful one for her.  

Thank you for your help!

Danielle McNeil