Well, your paperwork coincides with the pup you have by the sound of it, should have been the first clue you had (apparently) the wrong pup eek!
For me and sorry perhaps legally too, it is too late for you now, you were given the pup in your hand, and as you say you accepted the pup without a word, you were given coinciding paperwork, which you seem to have queried but yet again you accepted the explanation along with the pup, you paid and left with said pup, you can't really say now that you have the wrong pup, you missed your chance there.
Even if you have e-mails detailing your request for the Grey pup, it is all too easy for the breeder to say that she now offered you the Blue and Gold and you took it, it would be your word against hers. Alas, you took the pup.........
Although colours in some breeds do change most breeders do know which colour they will end up and often wait to make sure, so that paperwork and colour coincide, I don't understand why anyone would advertise Grey and then put Blue and Gold on paperwork, something is not right here, you are right to query, but in taking the pup, I don't know........
If you paid a
deposit on the Grey and have e-mails to prove you chose the Grey, then you should have had it, it's the breeders mistake if she chose the wrong pup for herself, she has legally sold it to you once a
deposit is paid, unless she wishes to hold out for her day in court, if you paid
no deposit lkj, then I'm really sorry but the breeder has no contract with you and does not have to sell you the Grey, even if she firstly agreed, she can pull out anytime,
TBH lkj the only defense I think you can seriously use if you paid a deposit, is that you forgot your glasses (even if you don't wear any) or took the wrong pair so it wasn't until you got home that you realised your pups colouring. I can't think of any other way you can get out of taking the pup and paying for it, you can't use the excuse that you felt hesitant, especially when the paperwork matches the pup. You've also allowed time to lapse, the worst thing against you of all......you've kept the pup and taken it to the vet.....you should have done an about turn in the car and immediately gone back to query things.
Also with the time lapse......... if a deposit was paid, you would still have to prove that you did not
agree to take a different pup as the paperwork is not for a grey...........
It's all very messy.... and your legs are getting shorter and shorter here as time passes...........
I too do not understand how you know the breeder wanted the grey, but it was on offer to you, were there more than 3 pups, more than two greys? **scratching head**
It's an interesting one, but I have to be honest, if I had taken and paid for the pup, I'd be cross with myself for not saying anything at the time, but it would be on me, my mistake, I'd just love the pup I'd taken and tell myself I must speak up next time. (Unless the pup were for showing or part of a potential breeding programme, then you have to stand up for yourself if you've paid that deposit)
Many moons ago....I went with a friend to collect a female lab she'd reserved, in chatting to the breeder so much, the breeder had popped the pup in my friends carry crate, we'd left, all was well and then low and behold half way up the motorway (an hour into our journey) the pup my friend was fussing over in the back seat rolled over on its back, well...........definitely a boy!!!!
We did an about turn and went back, the breeder was mortified, mistakes happen, but my friend said if we had got all the way home and the breeder hadn't had a home for him, she'd have just kept him, (pet dog only) as she'd already began to bond.
These things happen, and the longer you are with this pup the harder it will be to give it up, in fact it probably is already anyway.
I would just suck it up I'm afraid, unless there is an underlying health issue here.
But, I'm very interested in your outcome........we can always live and learn,
I hope you'll be happy whatever choice you make here.