I am wondering how long before a rat becomes full grown, or grown to the point that he is grown, but not yet filled out.

My baby Guinness was born on June 13, making him 7 weeks old. He is already quite large, and doubles in size every week, and seriously looks bigger everyday. His head is already filling out, his tail his big and thick, his adult hair is grown in.

he is quite a hefty boy, and well on his way to being a big squish, i am trying to gain an idea of how big he is going to get. I didn;t think he would be so big so quickly, but i am new at this, so i don't really know whats normal

any input is appreciated- Thanks

At 7 weeks, they're usually pretty teeny still... he's got some more growin' to do!

My guys are 8 months old, and fairly full grown... they weigh between 500 and 600 grams right now. If you can get a scale, you can weigh them and see how they compare.

oh wow...now i am getting nervous....

he is definitley not teeny...not at all... i know he comes from big lines, but in another week or two, i think he will be the size of his mom...and she was a good size lady.

I might have ratzilla on my hands    so much for my parents wanting a smaller rat 

and he already has a bit of a belly....maybe i should switch to lab blocks...he loves to eat..and eat..and eat...

I will definitley weigh him tonight....ahhh...i hope is not bigger than my dog ...hehe 

He eats 1/4 cup of subees mix a day, sometimes leaving a bit over in his tube, but finishing it at somepoint later in the day. I think lab blocks may be a better choice as he is quite the ravenous and speedy eater.

I weighed him...i did the best i could considering he wouldn't sit all the way on the scale...but he was about 125-150grams i think

is that big? its just weird cause he doesn't even look like a baby anymore...

i just hope my guinness dosen't set the guinness record for the worlds biggest rat!-well at least there will be lots to love

You can do a combo!
That's what I do.
80% of their diet is harlen teklad lab blocks.
20% is whatever else I feed them, sometimes it's Suebee's Mix, sometimes it's whatever I feel like tossing in their bowl. LOL!

Meh, I've got a 5 month old male with the slim line body of a female (trust me, he's male there's no missing THAT!)
My past 2 males at 6 months were certainly big squishes. Not sure what gives. Perhaps a more active life style at a younger age then what the last two did... If anything a male that's healthy but not on the fat side would be a good thing to me!

thanks for the help and tha analogies  i think he is already a soda can with a tail...we are well on our way to becoming a bottle 

I got a hold of lab blocks today finally, so hopefully it will keep his belly from getting to big, as genetics is going to make him big enough!

8 weeks old and he weighs 265grams...the lady i got the lab blocks from, and who clipped his nails today (yay for no more scratches) thought he could be up to 2-21/2 pounds by the size of his feet and "big bones"-only time will tell, more to squish and kiss

I got him from a breeder, who believes in good size rats- granted i wasn't quite aware of how big, but i saw his mom when i picked him up, and she was a good size, but healthy not fat, just big; thick and solid.

I did not meet his dad, but i was told he was a good size. I somehow just didn't realize he would get big so quickly. I am hoping he is just an early bloomer and will slow down a bit sooner.

He is well proportioned, with big feet-which i guess he will grow into, he has a nice thick tail, big dumbo ears...he is just, big-i guess

I was spoiled with my last rat too, he was probably this size full grown (i got him at 6 months), maybe a bit bigger, so it was a bit of a shock when this one shot up like this.

He is from a line of specifically bred rats, so no obese lab rat in his line unless its way back...

i have never heard of such a thing...how sad poor giant lab rats

Here is an example of how big some rat become, Its Hershey, CJ's boy (sorry I nabbed the pic ... hope you don't mind)



And yes, its a 2L bottle in the back.

next to a gallon of water...

........ I cheated..  heh

You keep an attack rat?! 

What breed of rat is that? I want one!!!!!

Matisse!!!!!!!!!!!!!!  more Matisse!!!!!!!!!!!!!!!!!!!!

I have a girl 6 mos old weighing only 200 g. She refuses to grow and looks like a mouse.