Many people fail "fostering-101". That's not anything new. To be a good foster, you have to send them on their ways. If you keep the dogs, then you will have too many to be a foster.
It is hard sometimes. After you foster a bagillion basenjis, you look back, and can remember that you had a few that were just exemplary dogs.
Like Mantis says, it takes a lot of effort to be a good foster, and to provide them the socialization that they might need. You need the ability to segregate your house if one doesn't get along with your own dogs. Then, you have to have time for each group individually.
All the comments herein from experienced fosters are consistent with my wife's and my experiences with fostering. We wondered to ourselves the first time how we would not get attached to our fosters.
However, when you remind yourself how your resident Bs own the house, the fact that there are other very deserving families/people who are ready and willing to provide a good home, and also in many cases how the foster B sometimes feels like a 3rd wheel to the resident B's, makes it a bit easier emotionally to let them go to their forever homes when they are ready. Best of all is getting email updates on their new lives with their families and how they are so happy and blessed with each other.
If you are a clean freak, fostering is not for you.
If you are always pressed for time on other priorities, fostering is not for you.
If you have a hard time managing your own B's behaviors, fostering is not for you.
If one or more of your resident B's are incorrigibly territorial, fostering is not for you.
If any family members do not care for the unique aspects of Bs, fostering is not for your family, because it truly becomes a family affair whether or not it's intended.
I take Blaze to the second home pet resort just north of Leduc. Even though he's eaten several leashes, blankets, jackets, and caused general mayhem, they take amazing care of him, and always smile when we come in. They follow his medical needs and keep me updated.
I get the medium kennel, which is indoor and outdoor, and they let Blaze play with the big dogs, which he prefers…
In my personal opinion, basenjis don't get along with most dogs generally unless they are brought up to do so. They are a small package with a big attitude.
My dog liked some dogs, others she would have outright wars with, especially if it had anything to do with her territory. My girl had a peeing competition with the scottie terrier across the way from us, every time we let her out, the first thing on her agenda was race off and to reclassify her boundaries! And when the scottie was let out she did the same.