After move, older cat hissing at younger cat
We have two cats. One is 3 years old, the other is just under a year. After living together in a flat since October last year, we've recently moved into a new home.
Since moving, the eldest cat has started hissing at the younger cat. She's become extremely hostile. She even hisses at us. I feel it's something to do with scent but I can't figure it out.