I'm going to take her to the vets to get her checked out this week anyway, as she's grumpier than normal and seems to have suddenly lost some weight, but isn't off her food, which is odd. I've also noticed this last couple of weeks that male dogs, neutered and entire, are all very interested in her back end and even one of her best friends who sees her most days has been going mad trying to hump her. She's 8yo and was neutered about 4 years ago. She's also been humping other dogs this last day or two and I'm just wondering what's going on! Any ideas what this could be? Like I say, we're at the vets this week anyway, so I'll get her checked out but I'm curious what could cause this.