Because your dog loves you so much, you will probably have to deal with a jealous dog at one point or another.
Sometimes it is growling when you interact with other pets, or maybe even when it comes to other human visitors. It's not a huge problem, as long as it only stops at growling and only happens to the occasional visitor. However, when a jealous dog attempts to come between you and your partner, it becomes a bigger and more pressing issue.
An important first step to controlling your dog’s jealousy is to determine what triggers it. A dog's jealousy is more complex than just not liking your new partner; you need to determine what specific actions arouse that jealous response in the first place, before you can address them.
Sometimes that trigger can be touching or embracing, and this is a clear sign that your dog is being protective of you. Keep a lookout for key signs in your dog’s body language, such as a tucked tail, lowering of the head to the ground and barking or growling. They display any number of those actions before a more aggressive response occurs.
The biggest key to a dog's jealousy is the fact that they have lost their place in the pack. If they think they are the leader of the pack, then as a follower, it is not your place to touch others without their permission.
To cure a dog's jealousy, you must assert yourself as the leader of the pack again. When they are vying for your attention when you are with your partner, stand between the dog and the partner and firmly tell them 'no' to discourage the behaviour. If they back off, reward them with a treat. If the behaviour persists, remove them from the situation to calm them down.
Not addressing your dog's jealousy issue could spell trouble for you and your partner. If left unattended, your partner may be scared off by your dog’s aggressive attitude. If your partner stays and the jealous behaviour continues, it could even result in violence. No one wants to see someone hurt or a dog put down simply because it was assumed that the dog would grow out of this behaviour. After all, dogs don’t grow out of behaviour; they need to be trained out of it.