Well, here's a photo overload for ya! Because I know there are other quirky awesome kids out there who love the Fetch show, too, and let me tell you, there are VERY FEW Fetch Birthday party ideas floating around the interwebs. Weird but true. ;)
The redhead chose a Fetch theme months ago. He's been stoked about it. Fetch is a pretty cool show, I have to admit.
Anyway, here we go:
Invites: I modified the Fetch Club invitation (lots of printables somewhere on here)
to turn it into a birthday invitation, also adding the bunting Ruff is
holding to make it more festive, and the number 10. Oh, and taking out
corporate sponsors on the bottom. ;) Because they didn't pay for the
party.

Also from the print shop (I don't have a color printer, so I emailed
some PDF's to a local print shop and had them print on white cardstock.
Then I swung by and picked everything up - easy!) were these
certificates, also modified from printables you can get from PBS.

If you look closely you can see what I did (click to see it bigger)

And I printed a couple pages of cropped Ruff heads and attacked them with my circle punch. We'll come back to these.

Other decor/projects: a door sign,

some fun foamboard cut-outs (yes, I like cut-outs
and this one seemed appropriate. I painted these while watching
election night coverage - funny, last presidential election I was making these invites for his Star Wars party!),

I covered an oatmeal box with orange duct tape,

and of course, made some of these:

which turned into these happy guys (hee!) with some circles!

Speaking of circles...

This easy peasy garland was done with baker's twine, washi tape and
the cardstock circles (and if anyone is in need of one of these, I could
be persuaded to give it away). It is about 6 ft long.
Um, I kinda love this (the photo's a bit bright, you can't see all
the detail on the sign, but oh well). The blue streamers are to
represent the blue siding in Ruff's garage Studio G.


Watching Fetch as guests are about to arrive:

(Our couch isn't always placed that awkwardly, we moved it to create a bigger open area. Which was very smart.)
See the orange shirt? It's this year's birthday shirt: 10 dog bones
(stamped with a cookie cutter and fabric paint) for a newly 10 year old


We got these lanyards (ordered CHEAP on ebay) on the boys quickly before this happened:

But they chilled out a bit to do an activity page (also from the Fetch website).

BTW, I didn't plan on repeating the lanyard thing (Lego party),
but they had a printable name tag on the PBS website that was too good
not to use. Plus, it's kinda fun to have something for the kids to wear
that's not a party hat (or a tshirt, which would be more $$).
Then the kids were divided into two teams and given their first
challenge (I made up some story about Ruff wanting to build a tower onto
his doghouse, so he wanted them to try and make something tall with
materials found... in the mailbox (oatmeal box)! GO FETCH!

Inside the mailbox were marshmallows and toothpicks (we love this).


They could work individually, in pairs, or however they wanted, but
the winning tower got extra points for their team. Star stickers were
given out for the backs of their tags, but we weren't consistent at
this.
Next up: a challenge to make the slowest paper airplane (again, I
made up a little two-second story and the paper was in the mailbox).

They had a few minutes to build and test and modify, and then we had
them compete a few at a time to see who won. Our crazy-high ceilings
came in handy!

Next up: target shooting with nerf guns. My husband hung up paper
plates from the ceiling in the playroom (I wrote numbers on them and
drew cats on a few of them - because Ruff doesn't like cats) and they
had to add up the points they got for their team. Everyone got six
shots, and my daughter was busy reloading guns while my husband kept
score. This part got a little crazy, it would have been better with a
smaller group! ;) And I took no shots during this section, but you can
see the plates here (and the cluttered not-Apartment-Therapy-worthy-anymore playroom! ;)

After this we did a Half-Time Quiz Show! Each team was asked five
questions. They varied between questions about what we'd done at the
party, questions about the birthday boy, and questions about the Fetch
show. BTW, this is about when we stopped keeping score for the teams
and no one noticed or cared.
Then it was time for cake!

(and 'kibble' (cocoa puffs), skittles, soda, and chips - wow, junk!)
Because I'd glazed cookies the day before, I didn't feel like FULLY
making a frosting mess again the next day by making a Ruff cake. So the
wonky cake has 3 dog bone cookies stuck in it and skittles around the
edges. Done and done.
I broke out some of my precious Heather Ross fabric as a little table runner. Orange AND dogs! Perfect!
I had a couple more activities planned (make a costume for a stuffed
animal out of paper and building with index cards) but we ran out of
time so we opened presents next, the boys hung out, and then they got
their 'doggy treats' and certificates.

The treats were sugar cookies and more 'kibble'. I really like giving cookies as favors
instead of plastic junk. I glazed the dog bone cookies and ... well,
maybe I'll get it right the third time around (Monkey's party will be in
April! I kinda hope he picks a Lego theme, because we already know what to do! ;)

Then, when I'd kicked all the guests out, we all took a deep breath
and vegged on the couch for a while while the boys went through the loot
pile.

And from an autism standpoint:
He did awesome.
I was a little worried, because, while I haven't written about this
here, the redhead has NOT had a great year. Especially post-fire. But
we are in the midst of changing some things up and trying new
treatments, so hopefully things will start looking up. ANYWAY, being
around a million (11 guests + a brother) boys sounded too hard. But he
really wanted to invite a lot of boys, plus our street has a million
boys on it and they all play together, so it's hard to draw the line.
PLUS, his next party will be in two years... and who knows what the
social situation will be then. Maybe there won't even be a friend
party. So let's live it up this year, I say! It was LOUD and he didn't
love that. He didn't fully participate in all the activities, but he loved having his friends over - he was so happy. He LOVED when they
sang to him, and made a nice little 'toast-like' speech afterwards. He was ready for them
to go, but after an hour or so break, he went right outside where most
of them were playing in the snow. Boys are funny.