Dude, go for it. I got last year's model of the dc25 on clearance at Target, and it was the best money I've spent setting up my house. It's kind of scary how much fur it picks up, and I vacuum twice a week!
Yes, the only difference between that and the "animal" version is one attachment, which you can get on Amazon for usually around $40 if you really want it (it's the turbine head for the wand). I haven't bothered - the attachments it came with are sufficient to meet my needs -- I don't have a broom, I use the vacuum on both carpet and the (gunky, old, 70's contractor-grade) linoleum, as well as on my couch, mattress, to clean windowsills, blinds...
It's a little annoying that the bin is small - my 805 sq. ft. apartment generally fills the bin twice (mostly carpet). But it's getting the dirt out! And it's bagless, so it's not costing anything to empty it frequently.
Do it!! Totally worth it when you have dogs!