We have 3 dogs. A 1 1/2 y.o Australian Cattle Dog mix, a 1 1/2 y.o. Beagle mix and a 4 y.o. cockapoo. Up until about 3 weeks ago they all stayed outside during the day and came in at night. The Cockapoo is going blind so we now have her in the house all day. The problem is that the Aussie is starting to get agressive with the Cockapoo when she is let into the house.(She doesn’t do anything when the Cockapoo is let outside) She has also growled and snapped at my daughter twice now. I can’t think of anything that has changed other than having the Cockapoo in the house all day. Could it be jealousy? Any training suggestions?