Your animal allies may change over time. It was this conundrum that caused me to avoid association with a spirit guide. That issue has been resolved for me.
I spend a great deal of time in the woods. I am quiet enough to not disturb the wildlife. I feel a kinship with all the animals. I almost never see the same animal twice. So as in the forest, as in life. The ally you have today may have to do something else tomorrow freeing you to experience a new ally.
Peace and Harmony,
Dave the Druid