Dogs and cats form close bonds and do grieve deeply when they lose a companion animal housemate they are attached to.
Lethargy, loss of appetite, vocalizing, searching behaviors, anxiety and loss of interest in play are common grief responses in dogs and cats.
Intensely bonded pets that are more dependent on their companion are likely to exhibit stronger grief reactions.
Keeping routines consistent, allowing them to process loss and giving extra love and patience can help grieving pets adjust.
Grief is a process. In time, most pets will start to return to their normal selves as the acute pain lessens.
Once they are ready, introducing a new pet companion can help dogs and cats transition after a loss. Go slowly with introductions.
If grieving behavior persists beyond a few weeks, consult your veterinarian to rule out any medical issues.