Photographing pets and all critters is a passion of mine. The challenges are endless. Lighting for instance, I prefer ambient or existing light but use on camera flash for fill as needed. Behavior can be a challenge also. You never know how an animal is going to act or respond to your presence.The more time you spend with camera in hand around animals the better. Once they get used to you they settle down a bit and let their unique personalities show. That's what your looking for! Remember, more than a likeness. Find that 'something' they're about and catch it. Enjoy and keep shooting!