Answer: Regarding is this aggression or play, it sounds like play. An 18 month old dog is usually still a puppy although an older and larger adolescent. As puppies grow up, they don't know the rules for appropriate human play without some training or guidance. Your dog is most likely excited, has a lot of pent up energy, and is visiting this unwanted play on you.
- Jump on you or tag you at the top of stairs or icy grounds (dangerous for obvious reasons).
- Jump up and hit your eye socket hard with their nose (closed mouthed). Or sometimes they hit your nose which hurts worse.
- Try to pull you off something like a bike with their teeth.
- Tug, bite, and tear at your clothes.
- Play tug of war with the lead you are trying to walk them on.
- Hard nips bordering on bites during exciting play.
- And so forth
Although something may be normal or typical for a dog to do, that does not mean it should continue. Anything that is potentially harmful to the owner or public, whether it is intended or so or not, should be stopped and redirected.
Jumping isn't simply broken. Training needs to happen for those behaviors to be diverted and changed to something else. Training provides a means of communication and partnership between a dog owner and their canine companion. It also allows for a relationship to develop where there is more understanding through increased interaction on both sides.
Trying to figure this out by researching online or through books right now will probably only hold you up from your goal of a better relationship with your dog, although that is an option. I would suggest that you find a dog trainer that can help you learn to teach your dog some better behaviors:) There is no real quick fix tip that I can give you that would be reliable in the long run. However, I would suggest the basics in obedience, and to also find play outlets that your dog enjoys that do not encourage jumping (tracking, tricks, hiking, et). Combining both of these objectives together, will give you a more complete plan.
This will make life so much more enjoyable for yourself and your dog in the long run (and probably the short run as well).
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