Have Cat Questions? Ask a Cat Vet Online.
Good evening and thanks for your question. I have a few questions for you.
1) You said that he may be constipated. Are you seeing frequent travel to the litterbox? He is acting constipated? Are you able to tell if he's producing diarrhea/solid stool or urine regularly?
2) When was the food switch?
3) How long has the vomiting been going on?
I'll notify customer service. Thank you for your reply.