introducing a cat to Barley

My mother in law is not well and we maybe taking on her cat.Now he kills wild rabbits but before he lived with my m in l he used to sit in a hutch with a bun,no problem.Do you think it would be signing Barley's death warrant if we took him into our small house?We have grown quite attached to this cat but obviously B 's safety is most important.

i think provided they were never left unsupervised togheter it would be fine... could you trial it for a few weeks to see how it works out?x