I found the following in the book "Animals in Spirit" by Penelope Smith. Ms. Smith relates the experience of fellow animal communicator Teresa Wagner, who received anger management counseling from a whale she was familiar with.
What follows is paraphrased from the book. I figure re-telling it in my own words will help me assimilate it.
Your anger is leading you down the wrong path. There is a better way, a way out of your outrage and grief, and a way to help everyone involved.
Take a deep breath and fill yourself with love. Get back in touch with that limitless love that you know is within you. Support your own broken heart.
Remember that you are never helpless to shower someone who is suffering with love, even when you cannot physically help. Send your love to the soul of the animal that has suffered. If he has died, ask for blessings for the journey of his soul through time and space.
Then send the same love and comfort to the ones who loved the animal. Whatever hurt you feel, they grieve even more. Surround them with love and compassion.
Then you must send the same love and compassion to those who caused the suffering or death. Anger at them gets you stuck in anger and does no good. Send love to those known or unknown to you who caused the suffering because it is only with love and compassion that their consciousness will expand to see the souls of animals and their hearts will understand and direct their actions. Compassion will help them to grow.
After this, you must tend to your own grief and sorrow. Honor your feelings even if they are dark and confusing. Ask for help to understand and release these feelings. There is always enough love and support for everyone. Reach out for help. Your own heart is as important as the suffering of others. Tend to yourself with great compassion and love.
This process is about acknowledging the overwhelming energy of your feelings and turning it into something positive for everyone, rather than allowing it to trap you.