6894kevin- I got into fostering dogs because someone pointed out how many are killed because people won't take the commitment seriously and follow through until the dog dies a natural death (I have seen a list of reasons why people give up their dogs and some are as stupid as "the dog poops more than I expected" "the dog won't stay off the sofa" "the dog eats more than expected" "I do not like the color... we did not have its tail docked when it was young and we don't like dogs with tails and cannot afford to get it done now..." A senior dog that had been given away on Craigslist had his mouth duct taped shut and some scumbags let other dogs rip him apart for "fun".
Yes he is a big mean looking Pit Bull with cut ears, but he is super gentle loves adults and kids and most other dogs. He ended up in a shelter in FLA and was about to be injected with sodium-pentobarbital...or worse stuck in a gas chamber with other dogs and cats and forced to inhale CO2 until he was dead-while possibly being attacked by other dogs and going after cats etc....... all because he was homeless.... I could not let that happen to a gentle 9-10 year old dog that had 100-200 recent scars on his face/legs etc...
I found a rescue group on FaceBook that was interested in pulling him from the shelter and transporting him to me. Did he have issues, yes, was he an incredible dog that deserved to live the rest of his life out, out of pain and torture, ABSOLUTELY.. I had him for about 2 months when the girl I was dating adopted him.
I have had 3 official foster dogs, saved and placed 3 puppies independently, and have 2 dogs I could let be adopted by the right people and situation. It is extremely rewarding. But know this, most dogs (not all) end up in shelters because of behavioral issues, they might dig, or bark, too active, too big, or be aggressive. Normally aggressive dogs are known by the shelter and that info is conveyed first and only sent to pros. Shelter workers are more likely to tell Rescue groups about behavioral issues because they want the group to pull more dogs over and over again. I have found the shelters may not tell an adopter as much. But many dogs that end up in shelters just have lame caregivers, or a situation that is truly uncontrollable (death, cancer, jail etc)...interview the Rescue group before committing. You can email me if you have more questions. You want an active rescue that has a fast turn over... not someone that is just acting like a rescue and dumping dogs with fosters long term.. The fosters I have from groups usually only stay with me 2-6 weeks (the first was the longest because of his age, and the rescue was out of FLA) The latest group I work with is only 45 miles from me and have turned dogs over quickly.
As far as the dog you listed above, have your friends get in touch with a breed specific group and see if they can make a donation for the group to take it (generally around $200 is good) if tthe dog is HW neg and UTD on shots, chipped, spayed or neutered...and really a great dog... (Black dogs are the LEAST likely dogs to get adopted after Pit Bulls). If the do an OS (owner surrender-the dog may be killed before they get out of the parking lot-YES it happens). OS dogs have NO legal hold time. and ones that are not fixed etc are costly to get into a medical situation where they are adoptable. Currently in my local shelter 60% of all dogs that enter the shelter leave in a garbage bag.. many counties it is 90-99% of perfectly good dogs are killed for being temporarily homeless. Many AKC or "purebreds" end up having more genetic health issues than mix breeds. Some people here will tell you their horror story about a shelter dog and how buying from a breeder is the "only" way they will ever go.... your tax dollars go to kill purebred dogs in shelters too. Good Luck.
http://stubbydog.org/2012/07/everyday-heroes-foster-families/