If slightly potty-ish ones are okay:
Did you hear about the Indian who drank too much tea?
He drowned in his teepee.
IDT: That rottweiler one is SO BAD! 
A man walks into the doctors office. He says “I’m a teepee! I’m a wigwam! I’m a teepee! I’m a wigwam!” The doctor says “relax, you’re two tents”.
A man takes his Rottweiler to see the vet. He says, “Doctor, I think my dog is cross eyed.” The vet picks the dog up and looks into its eyes.
After a minute he says, “Umm, I think I’m going to have to put him down.”
“Put him down?” the man exclaims. “Why, just because he’s cross eyed?”
“No,” the vet replies. “He’s heavy.”
Here’s one I read in another thread:
A man goes to see his doctor. He says, “Doctor, I think I’m losing my hearing.”
The doctor says, “All right, what are the symptoms?”
The man replies, “They’re a yellow cartoon family. What’s that have to do with my hearing?”
Knock, knock.
Who’s there?
Tarzan.
Tarzan who?
Tarzan Tripes Forever.
Q. What do you call the Golden Gate Bridge at 5:00 p.m.? (Or substitute any local heavily-traveled bridge.)
A. The Car-Strangled Spanner.
What big and red and eats rocks?
A big red rock eater.
What’s big and red and eats sand?
A big red rock eater on a diet.
What’s big and red and eats leaves?
A big red rock eater who is a vegetarian.
Why do elephants have big ears?
Noddy wouldn’t pay the ransom.
What do you give a sick elephant?
Lots of room.
Why are elephants big, grey and wrinkly?
Because if they were small, white and round they’d be aspirins.
What did the pony say after he cleared his throat?
“Excuse me, I’m a little horse.”
Gotta say it- huh?
Knock-knock
Who’s there?
Ima Pielup. (Eura works too.)
Ima Pielup Who?Say it out loud.
tee hee
Probably because I’m not 7, this one goes right over my head.
Big Ears and Noddy are cartoon characters.
I told that once to my British coworker. He laughed for almost a full minute.
Got it- thanks!
My daughter’s contribution (she’s 9 and made this up)
Q. What do you get when you cross a grandma with an octopus?
A. I don’t know, but it can sure play bingo!
Forgive me if these have been told before. . .
What do you call a cow with no legs?
Ground beef
What did the snail say when he rode on the turtle’s back?
(throw your arms in the air and yell) WHEEEE!
You can also go to your public library and check out the children’s section.
My library has a few rows of joke & riddle books, in the non-fiction section in the 818.6s. Veryyyy popular. Fastest book display to disappear that I’ve ever had.
/Shadez
Why is six afraid of seven?
Because seven ate nine…
An oldie but a goodie.
What do you call a cow with one leg?
Steak.
What do you call a cow with two legs?
Lean beef.
What do you call a cow with three legs?
Tri-tip.
You know how when geese migrate they fly in V’s? How come the one side of the V is longer than the other?
Because there’s more geese on that side.
What’s green and has wheels?
Grass. I lied about the wheels.
What do you call a boomarang that doesn’t come back?
A stick.
What’s brown and sounds like a bell?
Dung.
What do you call without any eyes?
Fsh
There was a little boy who was tractor-crazy. Loved tractors. Had them on his bedspread, on his pyjamas, his lunchbox, posters of tractors on his wall. When he grew up he bought a big shiny tractor and it didn’t work. Then he bought another and that didn’t work either. So he gave up on tractors. One day he visited a diner and the waitress said, “Sorry about the smell of smoke in here but yesterday there was a fire in the kichen and we can’t get rid of the smell”. The man says “no worries, leave it to me” and when the waitress returns, she says “Wow the smell of smoke has gone! How did you do that?” and the man replies “I’m an ex-tractor fan.”
(My 11 year old laughed and laughed, when he finally got it!)
A chicken goes into a library, walks up to the librarian, and says [in your best chicken voice], “Book.” So the librarian gives it a book. The chicken tucks the book under its wing and walks out.
The next day the chicken comes back. “Book, book.” The librarian hands over two books. The chicken puts them under its wing and walks out.
The next day, the chicken comes back again. “Book, book, book.” The librarian gives it three books this time. The chicken put the books under its wing and leave, but this time the librarian decides to follow the chicken. He follows the chicken out into the street, all the way across town, into the park, up to a pond, where there’s a frog sitting on a rock.
The chicken shows the books to the frog. The frog says [in your very best frog voice], “Read it. Read it. Read it.”
Seriously, it cracks the kids up.
What did the farmer say when he lost hist tractor?
“Where’s my tractor?”
Might be just a little risque for a 7-10 year old, but what the heck:
“What do you get when you cross an elephant and a rhinoceros?”
– “Elephino!!! (“hell if I know!”)”
Tripler
Thanks, I’m here all week!