Charity vets in Liverpool?

Does anyone know of any other than the PDSA?

I usually take my dogs there but according to their new system there can only be one registered pedigree per house hold. I have two shih tzus. About six months ago one of my dogs were ill and needed vet care (nothing serious, he's alright now) but today I woke up to my other dog screaming in agony. Having immediately taken her the vet I was told that they're going to refuse to give her anything other than emergency care as apparently the last dog we took is the registered one (although we were not aware of this, when it happened). The vet on staff said my dog has most likely slipped a disc in her neck and she needs to be treated but I simply cannot afford to go private! I've phoned round a few private vets to get estimated costs and there is just no way I'd be able to afford it, but she is absolute agony and desperate need of help!

So if anyone knows of any other "charity" vets in Liverpool then please let me know

Many thanks