maledog marking

Question
My 5 year old Maltese/bichon marks everything plastic bags cans my bed everything and he has been doing this for a long time . I have also 2 other female dogs a great Dane  and a Chihuahua. I need this to stop

Answer
1. is the dog altered?  Neutering can sometimes stop this.  But, if he's been doing it for a long time, you're probably not going to be able to stop it.  About the only thing you can try is keeping your dog with you all the time and when you can't watch him, he's needs to be crated.  And, buy keeping him with you, I don't mean in the same room, just roaming around as you're working on the computer or something, I mean, on leash and attached to you.

Good luck.