Hi hope someone can help me. I have 4 cats all which are so lovely. We have recently come back from holiday and the person who was looking after them has said some strays have been inside the house. Since we have been back we have noticed none of the cats want to come inside the house anymore, and if they rarely do they go nuts, run about and run outside. Why are they doing this and how can I get my babies to come in and let them know eveything is ok??