Others may reach resolution quite quickly. It does not mean they loved their pet any less, it's just their individual reaction to their loss. In most instances, the grieving process may continue for a few months to almost a year. This is a defensive mechanism we use in an attempt to insulate ourselves from the emotional trauma we are, or are going to, experience. Although this is not as common when a pet dies, many people still experience this stage of grief.
Anger is a common stage of grief that follows denial.
Anger may be towards others such as the veterinarian or another family member. It may also be directed towards oneself in the form of guilt. Some owners may feel angry at the pet for leaving them alone. Sadness is the stage we most often think of as grief. For many people, losing a pet may be one of the saddest experiences they will ever have.