Is there a chance that biomom will find somewhere for the dogs to stay during the visit?
It hardly matters. The "rescue" the grandma is running has a web site with video of at least ten dogs on the couch with grandma in the house. She has spent months posting about the fact that she is living at her daughters. And they aren't even denying that the rescue moved into the house. They are saying it's a perfectly safe and sanitary environment even with all the dogs there. We'll ignore for a moment than one of the dogs killed the children's cat and that several of the dogs, by the grandmother's own admission, are going to have to be in the grandmother's care for the rest of their lives because they are adoptable due to behavioral issues.
Gosh, what a frustrating situation. Where I live, such conditions can be reported anonymously to CPS for unsanitary, unhealthy conditions. We once had a family in our area lose custody because they had a deer living in the house as a pet.
Went to the CPS website in the state in question and they directed me to make a complaint directly to the county SPCA, which I did. Unfortunately the bar in that state to get CPS to do anything is really high. Basically, unless they walk by the front yard and the smell of feces is coming from the home, or unless there is an actual attack on the children, there isn't anything they can do. There are also no pet limits in that particular town.
regarding the carpet - bleach! lots of bleach! and pet shops usually carry all kinds of odor eliminators. another odor neutralizer that works well is distilled, white vinegar. it works amazingly well actually. i believe there are also carpet cleaning services that have gear can penetrate down real deep and get their cleaners into the carpet underlayments and padding, and sometimes even into the floor boards underneath.
If we had true white carpet bleach would work perfectly. Unfortunately it's an off-white light cream color so that's out of the question. We have the spots basically cleaned and deodorized at the moment but there are still stains. We are totally going to be trying to get a professional in here asap.