Animals were created before humanity, and God saw that it was good.
Animals have the same breath of life in them that we do
Also, I believe it is Biblical that animals will be in the life
to come following the resurrection and judgment of all
Some will say they have life, but not an eternal soul. The scriptures say that God doesn't withhold good things from His children, so I believe that if our heart's desire is to see our pets again then we will.
I like that animals were important to Him, that He would also include them in the Noahic covenant.
Genesis 9: "...I establish My covenant with you and with your descendants after you
and with every living creature"
Doubt there will be purple horses in Heaven, but maybe if you make the request