Guess this old breed!

 Chihuahuas?

i dont want to give it away just yet so i'll let you guys stew over it for a day  or two  

 my guess is JRTs

The first one looks like a Chihuahua, and the last one looks like a JRT, LOL. The two in the middle look like Pit Bulls, to me. It's amusing me that those dogs are all the same size. I know they're the same breed, but the faces are so different, on the four! 

AKC breeds at that and yes they're all the same breed.

i dont want to give away any more clues than that!  

Bull terriers?  

JRT's? I don't know! TELL US!

please?

My first guesses were Chihuahuas & JRTs

So my final guess is Rat Terrior

if not then I'm stumped

 Not that they look like today's bull terrier's but that's what I'm going to guess too.  They have the coat pattern and body shape, but yeah, the faces are all wrong.

I'm glad I got in on this!

Ok, Jack Russel...but I know it might sound weird...I'm getting a Pittbull vibe (A.S.T). Ok, tell me!!! What breed????

 Well JRT or Chi would not suprise me because thats what they look like.  My guess would be Am Staff's  or Bull Terriers, though I lean more towards the AmStaff.  I figure its gotta be a bully of some sort or YOU wouldn't have posted this LOL.

Darn your hide! you know me too well Candace!!

ok ok i'll tell.

Yes they are Bull Terriers... MINI bull terriers at that.

you guys werent the first to guess Chihuahuas or JRTs either  

amazing isnt it? hard to believe those heads went from that to this   i much prefer this physique to the other.

Yay!  

K now post another one.... 

They've come a long way in 100 years! That's some big time refinement.