[gingerale]

If you search for 'after spaying bleeding' on Google, you'll find others who had dogs with the same symptoms.

This site:
http://www.animalhealthchannel.com/spay/procedure.shtml
says...

Possible complications include bleeding after the surgery and incomplete removal of the ovaries. The pet's activities should be limited for the first week or so following surgery. Dogs should be walked on a leash and not allowed to run or roam. Pets should be protected from stressful environments (e.g., excitement, extreme temperatures). After the first week, animals can resume normal activities.

You should call your vet just in case. Good luck and hope Coffee feels better!