how much does he weigh?
what antibiotics has he taken?
what were his symptoms?
is he neutered?
why do you think his organs are shutting down?
Do you have any lab values you can post as to his BUN, Creatnine, CBC, HGT, PCV, ALT?
That is a relief that you have not been told or any organ deterioration. If he has continued UTI's he may have crystals in his bladder that are causing this. The abscess he had may have caused a systemic infection. Your vet may have to try a different antibiotic or a combination of two in the broad specturm family like Cavamox, Clidimycin, Batryl and the cephlexin he is already on. Open one cranberry capsule and sprinkle half on his foo twice daily - every 12 hours. Add unflavored pedialyte to his water 50/50 tombalance is electrolytes. He should be encouraged to drink but the output is not as important as the ease of flow or if hes any difficulty passing his urine or blood when he goes.If he does not have any such symptoms that cranberry will lower the PH of his urine and make his bladder inhospitable to UTI bacteria. Since he has had prior infections he should take the cranberry every day for life. Here is info:
Please let me know if you want to discuss this further and if you would like more links. I wil be happy to help.