RewriteEngine on
RewriteBase /{farm}

RewriteCond %{HTTP_HOST} !^{farmerhost}
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule (.*) {farmer}$1?virtual_animal=1 [QSA,L]

RewriteCond %{REQUEST_URI} ^/?$
RewriteRule ^.*$ {farmer} [QSA,R,L]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^{farmer}([^/]+)/(.+) {farmer}$2?animal=$1 [QSA,L]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^{farmer}([^/]+)/$ {farmer}doku.php?animal=$1 [QSA,L]