you should really consider doing a more controlled introduction like the articles say. We went through the same thing - hissing, vomit, hiding, resident cat looking sad etc. We felt awful after the first week thinking we made a mistake and wondered if we would have to find a new home for the...
We just went through our first integration with 2 year old resident and 3 month old kitten, and we did have an issue of the resident throwing up once. She has anxiety issues about being alone (developed crystalline urine issues) so the vet suggested we try a companion to see if that helps. The...
About 2 and a half weeks ago we introduced our resident 2 year old rescue to a 3 month old rescue (both girls) and for the first few days our RC didn't eat or go to the bathroom. We could tell she was really stressed, mostly because the kitten was super energetic while she is more skittish...