I would think sugarcatmom, growler, Love4himies, and luckypenny and Frenchy would be good choices to do blogs. They all have a wealth of knowledge in their particular areas of expertise. LP and Frenchy could write about fostering. The other ladies could do food and meds.
Are you using these blogs for people who go to the main page of Pets and don't come to the forum? Because if not it seems like it would be a whole bunch of repeated information? Personally I forget there is other parts of Pets besides the forum.