I have a canon 3Ti and I want to do pet photography. What kind of lens should I get?

[conlizjay2]

I want to do pets mostly outdoors and some inside. I use phot shop but still like to do less editing. I like to find a good lens for pets. I have one regular lens and a 80-200 lens.

[ebiggs1]

Not knowing what "regular lens" you have or what a "80-200" is, it is hard to advise.

However, never letting the lack of the thought process get into the way, the Canon EF-S 17-55mm f/2.8 IS USM Lens is a very good lens.  Along with the Canon EF 70-200mm f/4L IS USM Lens and you would have a fine outfit.  There is a cheaper version of that lens without IS, also (Canon EF 70-200mm f/4L USM).