Large Brown

what kind of spider has red legs up front & appears to drag around a large brown rear end?

I just saw the strangest looking spider. It had red legs towards the front of its body & it’s rear end was huge & brown. It’s rear end almost looked like it was not a part of the spiders body like a back pack. Kind of seemed like a small spider with a huge rear end. When I was pushing it out of the house I was afraid that its rear end was going to break. What kind of spider was this?

Maybe a Woodlouse Spider, (Dysdera crocata).
Here’s some info. about them, and some pic’s:

http://www.nhm.ac.uk/nature-online/life/insects-spiders/identification-guides-and-keys/spider-bites/woodlouse-spider.html

http://www.google.com.au/images?hl=en&gbv=2&tbs=isch%3A1&sa=1&q=dysdera+crocata&aq=f&aqi=&aql=&oq=&gs_rfai=

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