Dogs and cats (or other pets) are often great fun at weddings, and can really up the "awwwww!" factor! Just be sure to take into consideration care and safety for your pet and others involved. There should be someone designated to be responsible to watch/care for them the entire time (don't forget to have a bowl of water and food out), and bring your dog home after a short while if possible. For wedding day and engagement portraits, it only really works well if your pet has at least mastered some basic vocal commands. If all they do is jump around and don't know how to obey yet, that is difficult for everyone and nearly impossible to get really good portraits to have on display. If you're dog is totally out of control, it is best to do your session outside or at your home, and not bring them into a studio and risk injury to your pet or damage to big studio lights and equipment. So, if you want a few with your enthusiastic (but uncontrollable) puppy that is great, but make sure an extra person is around to take Fido for a walk so you can focus on doing great portraits.