UPDATE 4 ALL ...
Squeekie is officially off Meticam - woohoo. His crackly breathing has stopped which I think and hope means his lungs are clear, but I did notice his nose still seems congested. Once in a while I actually hear him sniff but he rarely sneezes. Squeekie is still on Baytril for another 11 days, so hopefully in time the URI will completely go away and not come back. I've also noticed his poo is slightly bigger. I am keeping a close eye on Squeekie's cagemate Mr. Pacman who isn't eating enough. Mr. Pacman eats lots of parsley and cucumber, but is eating much less pellets. There has been no significant change with Mr. Pacman for the last ten days but I have decided if he doesn't start eating more pellets soon, I will take him to the vet. He may have a URI too ... hopefully not. I'm wondering if him eating less is just because Squeekie has been sick, or maybe his teeth are overgrown ... only a vet can answer these questions. But for now, I'm waiting and watching because hopefully it is just because Mr. Pacman is in a seperate cage from Squeekie. it is hard for piggies to be away from each other, isn't it?