I'm very sorry to read of this. I'm an independent network dog rescuer and I also volunteer hands-on for a small, private no-kill rescue. The network rescuing I do means that I find no-kill rescue or foster places (and sometimes homes, following a homecheck etc) for dogs who are with people in your position and for pound dogs too.
Please can I say first of all that if your breeder didn't make it very clear to you when you bought Casper that you should return him should you not be able to keep him I would advise extreme caution in returning Casper there. They should have put this in writing at the start - if they didn't I would be concerned that they might only be willing to take Casper back in order to make a profit on him and without his best interests at heart.
I am also begging you please, please do not rehome Casper yourself... for one thing to rehome him responsibly will necessitate a thorough homecheck and for another, if the owner you chose also cannot keep him in 6 months time, what will happen to him then? You can't take him back, can you...
He'll be an adolescent dog without a home and could be passed on to anyone, could be abused, used as a breeding machine, as bait for fighting dogs, thrown out into the street or taken to the vets to be put to sleep.
Please seek out a responsible and reputable rescue - breed rescue would be preferable - which does the following things as a bare minimum:
- Has a complete no-kill policy.
- Homechecks EVERY new home thoroughly.
- Undertakes by written contract to take any dog they rehome back if the new owner can't keep him even if that is in 15 years time.
- Vet checks and assesses.
- Neuters/spays every dog (unless there is veterinary advice to the contrary) before the dog goes out to a new home.
- Vaccinates every dog prior to rehoming them.
- Offers lifetime support to the new owner.
Ask to see the rescue's rehoming form. It should look similar to this one. By that I mean that it should want to know the ins and outs of a ducks bottom because the dog's welfare comes first.
I'm more than happy to help you by finding a place in a rescue such as described above if you'd like me to - I have rescue contacts across the UK. Please pm me if so and I will then give you my email address, phone number and some references so you can check me out too. It's entirely possible that a dog this young could go straight to a fosterer rather than kennels (oh, so tempted myself... I love black Labs and have a black Lab cross who favours Labs in looks myself, as well as 2 GSD). I have on occasion even found homes immediately for such young dogs, so they have been able to be placed directly from the original owner's home, following a home check of course. In cases such as this I ensure that I have got a reputable rescue to give the dog "back-up" so that should there be a problem, that rescue will take the dog in and will advise and support the new owner.
Any decisions on where the dog goes and to whom is ENTIRELY the owners of course... I only seek and secure a rescue place and negotiate with rescue and owner. I work for the dog, not for any rescue, not for the owner, nor the prospective owner and not for myself. I know how utterly torn apart I would be to have to let any of my boys go, so if I can help you and Casper, please do pm me. Equally, if there is any way in which you feel you might be able to keep him with some help - for example, if your problems were temporary ill health and you needed a few weeks support or somesuch - please let me know what you need and where you are (not my business to ask why you need it) and I'll do my best.
HTH
Val