Will try and keep this as succinct as possible. N.B. Same-sex relationship (to avoid any confusion with pronoun use etc).
Me and DP have been together for 4 and a half years and living together for 7 months. DP grew up with dogs, really wants us to get a dog ASAP and is happy to let me choose the breed/sex/name. I've never had a pet and am not too keen on getting a dog right now. It's not that I don't ever want one but I just don't think I'm ready for the commitment yet (does that sound silly? I don't know?). We both work full time, as do my family and DPs family live hours away.
Puppies of the breed that we both agreed on (about 3 years ago as I said I would only ever say yes to a small sized dog) recently became available very very local to us and DP arranged to go and see them this evening. I didn't mind going as I've never been around the particular breed before and definitely never seen them in real life as puppies so thought it would be beneficial to me for when we eventually get a dog further down the line. We have just come home and DP is super sad because she really wants the puppy, keeps saying how it was the perfect shade, perfect location etc. DP has even just spent 10 minutes in the kitchen crying over it 
My argument is that it's not the right time (as we've only been living in the house for a few months, my commitment worries, our work schedules etc) and the price is higher than I personally would like (pedigree line). It all also just feels a bit rushed to me.
DPs argument is that it's the breed and shade that we want, the sellers were lovely, we got to see the parents and it's local and if we miss this puppy we may never get the chance again and will have to travel miles.
Not as if it matters (although I'm sure MNers will say "it obviously matters otherwise I wouldn't have mentioned it") but the house is technically mine - ownership, mortgage etc all in my name only.
AIBU? Do I give in and cash out on this puppy? Or do I stick to my guns and do what I think is sensible? 