So here's the pack 1 x male neutered collie X 13 yrs old 1 x female speyed collie 10 yrs old 1 x male neutered Black Lab 2 yrs old All healthy, well fed, watered and walked. We live in a spacious home, large garden next to fields. The female Collie has always been a bit odd, staring at nothing in corners, licking the furniture and the wifes suede boots (ewww!). Up until a couple of months ago everything was fine as far as the interpersonnel relationships went. Then the female collies started to snarl and pull faces at the male collie if he went near her. By which I mean just near, no intent, not sniffing her, just moving past or something. Now the female collie will just go up to the dog (say he's lying down asleep or resting) and just start snarling and bearing her teeth at him... so she taken to just following him about and doing this all the time until told to sit. She could be somewhere else relaxing, there's nothing forcing her in proximity to the collie. Totally fine with the Lab. Not aggressive to us or the cats. Really puzzled. Any ideas???