Well, he vomited again this afternoon, so we took him to see the vet. He's still acting normally, thank God. The vet prescribed Metronidazole for infection and instructed us to keep him on the rice mixture for a few more days. If he continues to vomit, I have to bring him back for blood work.
The vet also noted that both Mojo's back knees were slipping.
This doesn't seem to bother Mojo now, but the vet indicated he may need surgery when he gets older (he'll only be a year at the end of this month) and that it's something we must keep an eye on. I feel so bad for my poor baby!