You forgot to put a "^" before arvyre\.com$ on line 3
Code:
RewriteEngine On
RewriteCond %{HTTP_HOST} ^arvyre\.com$
RewriteRule (.*) http://www.arvyre.com/$1 [R=301,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^get/([0-9]+).gif$ /adoptables200/siggy.php?id=$1 [L]
oh and I just realized on your registration page the allowed length value for the password and password confirmation box are not the same...shouldn't you be fixing it?