Your pet has died and become sealed and now you want to revive your pet. There are two ways in which to revive a dead or sealed pet. The quickets way to revive a pet is to go to the Animal Trainer and select "release sealed pet". The Animal Trained will not do this for free, and the higher the level of your pet the higher the cost will be. The other way to revive dead or sealed pets is to "wait" out the time of the seal. Though you can't just wait it out as it may imply you actually need to fight it out. When a pet becomes sealed clicking on the pet icon will tell you how long the pet will be sealed for in game time. This varies according to the pet's level.