I have two English bulldogs. One male who is 6 years old and a female who is about 2 and 1/2. I have had them both since they were just little pups. Over the last month or so my younger female has started to become aggressive towards my older male unprovoked. I have never had issues with them before they are both great dogs and have always loved each other and gotten along fine. It’s not a constant thing and I do not have to keep them separated occasionally she just goes after him and I have to yell at them and break it up. I have noticed though the occurrences seem to be increasing and I am concerned. Any advice would be great! I plan on calling my vet in the morning!