Hi, I have a beautiful 23 month old cockapoo Flo, who is not neutered. I also have a 5 1/2 Yr old Female neutered lab, who is the most placid and easy going dog. As Flo has got older she is becoming more and more aggressive to Ellie, guarding toys, people or just space jn a room! She places herself in doorways and lies down so Ellie cannot enter, anc Ellie then hides at the other side of the room. This behaviour is not constant, but is daily and increasing. When not behaving like this they play and cuddle up together. Flo us a very bright girl, and knows she does wrong - every times she behaves like this she gets firmly told no and shut in the utility room for 5 minutes. As soon as we let her out she rushes to Ellie and licks her face submissively. This time out does not seem to be working, any ideas welcome please, as I don't want to have to rehome Flo, but this behaviour is unfair on Ellie, who hides from Flo. We will be heartbroken if this is the only solution, but this behaviour cannot continue. When jot doing this Flo is a typical affectionate, funny and loving dog..