Hey DznyLvr2005,
Well I'll be a little contrary to some of the advice you have gotten. Like you I adopted a Brittany...he was 6 months when we got him. And yes High Energy is the first thing that comes to mind...but temper that with another statment I read on on Brittany's( more correctly my wife did ). They will 'charm you into disobedience'. I've never had a dog that could turn their behavior around on you because they are masters at pulling heart strings. Case in point...I tell Berkeley( my Brittany's name ) to get off my bed. What does he do puts his head down and starts with the puppy dog eyes..."No I meant it OFF!" Berkeley slowly rolls over exposing his belly to be pet. "OFF!" some how an even more pitiful look appears on his face. I approach him and his little stubby( thats what i call whats left of his tail...i know its gross..but what are you gonna do ) begins to wag furiously and nothing but love and adoration appears on his face. If I start to move my hand towards him to make him get off...then his nose gently nudges my hand to be pet....and so on and so on...
before i get flamed..yes he does listen to me...its just and example of how when he wants to disobey he does it in away that makes me feel guilty or he looks just so darn cute.
weve had Berkeley for almost 2 years now...and he has "mellowed" somewhat. At about 1 year he was his most obsintate..lots of mouthing and stuborness. He's not really stubborn any longer..but is still high energy. He loves the outdoors....and there is a definte correlation to how much walking or running etc. you do with him to how calm he will be inside for us. A long walk and run..and he lounges contently in the house...lots of pent up energy because of no walking means i need to either play on the floor with him with a toy..or give him some toys to play with( we have lots ant lots of different chew things for him )
Someone said that Brittany's are not lap dogs...I think more accurately is that they sometimes think there lap dogs trapped in the taz manian devils body. Berkeley will slowly creep up and climb into my lap while im sitting at my computer...if I make any move that implies im going to put him down...down goes his head on my shoulder..and a deep sigh( more evidence of charm! )
He is incredibly affectionate and loving...and just wants to be part of the family...i will often take him in the car with me just to run down the street to run an errand...and you would think i just gave him a steak when i invite him.
I know also at times it will appear he has an never ending power source. We took him out over the 4th of July on a 3.5 hour hike...and he never slowed...and appeared he could go on for hours more...and im sure if we kept going he would have loved it...but once we got back to the car...ZZzzzzzzzzz
all the way home...which was a 2 hour car ride...( and yes he had his own seat and portable water bowl..food and even a bone

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Oh and one more thing I've noticed about my Brittany....he's a water magnet..he loves and loves ponds, streams, rivers, swamps.......and unfortunately MUD....
the one area im still working on him with is when he sees birds or squirrells when hes outside...he defintely has a hard time not wanting to sprint after them....he's pretty good with our cats too.....but his instinct does worry us from time to time...
Congratulations on your Brittany...I know ours fell into our lap..and I can't tell you how happy I am about it. I'm sure that many people here have given you great advice ...but I honestly believe this breed is very smart and loving and can adapt to your lifestyle and doesnt have to be a chore of constantly trying to diminish her energy by constant walks ( though if you have the time its probably good for everyone!!

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oh yeah..one last thing....for all their smarts..and I know this is true of most puppies....keep watch over anything small enough to fit in their mouth etc. I think our Brittany ate more socks then our Dryer the first 6 months we had him....and we would have bet our life that we werent leaving any around for him!