You can contact animals and bond with them. But you cannot shift or change into that animal. You can only get the characterstics of that animal mentally for example if you have like bonded with a cheetah then mentally you can run like cheetah by which it influences physically to run . If you want to bond to a particular animal, you need to know what animal your choosing, it's characterstics, your kindness, love to that animal and you should attribute the animals traits to bond with It.
Talking to animals, there two possibility's to comminucate, one is by animal language and another is through telepathy. In animal language we talk to the animals directly through means of our language or the animals language. For example if you want to say dog sit then we commniucate it by sounding like the dog like barking, howling, etc. It takes a lot of effort and years to pratice. It may sound crazy but it's wotlrth a try. Another is telepathy or pet telepathy. This comminucation is done by linking the minds of both the animal and the person. This needs alot of pratice and would make it easy if you had a pet you loved.