Oh no poor Silas and you. Hopefully the second round of antibiotics ones the trick and clears up his infection. Keeping my fingers crossed. You're doing everything you can both with the vet and antibiotic treatments, plus the proactive and preventative natural methods like the cranberry pill. Giving him lots of water will also help him to flush it out, and you could try putting organic apple cider vinegar in his drinking water everyday as well. ACV is a natural antiseptic, and kills bad bacteria in the body, as well as it boosts the immune system. It may help. Hope it clears up soon, and Silas feels better. Sending hugs and prayers for Silas and you, that its nothing more serious. Keep us posted on how he's doing. Since he's been on Two bouts of antibiotics, it's a good idea to give him some extra probiotics to give him back the good bacterial. Add 1 or 2 Tbsp plain unsweetened yogurt to his food everyday.