Speaking of dog doors, I've always been a staunch supporter of them, and my dogs LOVE them. But lately I've had a problem that I didn't foresee when I installed the doors, and that is of strange (as in not my) dogs coming in my house! In short, Lightning has a lover, Larry the Jack Russell. Lightning is a neutered male. Larry is an unneutered male, and he's MADLY in love with Lightning. Lightning's not quite as enamored of Larry. When he comes over, he obsessively humps Lightning until Lightning finally lets him know he's had enough. (I have invisible fencing, so my dogs' friends can visit but L&S can't go visiting.) Normally, if Lightning wanted to get away from unwanted company, he'd just come inside. Unfortunately, Larry appears well-versed with dog doors. I've been sitting in my living room several times when Lightning's come trotting in through the kitchen, and a second or two later, here comes Larry. It's such a shock to see a Jack Russell instead of Stomps, my other basset, come trotting into my house. Also, I think Larry might be marking in my house. I dont' know what to do--obviously Larry's parents, who were horrified the first time he went missing (straight to my house) and swore he'd never get away again, have since given up on keeping Larry away from the object of his affection. And our community is very tight and friendly, so I don't want to cause any rifts by insisting they keep him at home. I don't know what to do! Any suggestions?