Kitty Kitty Kittens
I confess I don't know much about this line, other than that they were immensely popular with children of the nineties and into the new millennium.  Their special feature was their "purring" mechanism -which I imagine must be a ball inside a tube- built into the cat that made a purr-like noise when the toy is shaken/rocked/moved.  Also appealing are their expressions which range from spacy to sad to surly.  I have yet to see a genuinely cheerful looking Kitty Kitty Kitten, but the pig I guess does have sort of a smile.

List of my Collection
According to the earliest laundry tags I've seen, Tyco started the Kitty Kitty Kitten empire in 1992.  I imagine they became available in stores in 1993, and were available intermittently until about 2003.  The latest date I've seen on a Tyco tag is 1996, though it's possible they continued making them longer than that.  In 2000, the kittens were marked DSI.  As far as I know, they were discontinued in 2004 or earlier.
This list is obviously by no means complete, just a listing of the all the different ones I've picked up over the years ;)  If anyone can help me identify or name the ones I have, I would be pleased to host any relevant information here.  I know that they probably all had proper names as well, one day I hope to learn them.  In short, this page is here because there doesn't seem to be *any* other Kitty Kitty Kittens information page out there yet.  The vast majority of kittens I have are from Canada and have bilingual tags on them.  I do not know if other countries had differences that aren't listed here.
Prepare to OD on cute...
 
Versions Seen: All white (possibly named Fluffy?)
Grey with white undersides (possibly named Tiger?)
Ginger with white undersides, stripes drawn on fur (possibly named Tawny?)
Calico - ginger/black/white.  (possibly named Calico?)
Siamese (pale beige with chocolate markings on nose, paws, ears), named Buttons.
Tan w/white paws/nose, named Mittens.

1992 Kitty Kitty Kittens (core line).   1992 Tyco Industries, Inc. Made in China. Purple writing on laundry tag, wearing chiffon neckties with sparkly dot pattern.  Approximately 10" long, "purred" when head was tilted/body was rocked.  These could have been issued pretty much any year, despite being dated 1992.  They were probably not issued the same year as those in the table below.
I have seen an advertisement featuring these cats all together; the names following are those given there.
Versions Seen: All white (possibly named Fluffy?)
Grey with white undersides (possibly named Tiger?)
Ginger with white undersides, stripes drawn on fur (possibly named Tawny?)
Calico - ginger/black/white.  (possibly named Calico?)
Siamese (pale beige with chocolate markings on nose, paws, ears), named Buttons.
Tan w/white paws/nose, named Mittens.

1992 Kitty Kitty Kittens (core line).   1992 Tyco Industries, Inc. Made in Thailand. Approximately 10" long, "purred" when head was tilted/body was rocked.  Pink writing on laundry tag, wearing hot pink plain chiffon neckties, some came with extra plastic lockets with a photo of the kitten inside, others had no chiffon collars but only rubber necklaces in pink or purple.  Although they share the same date as the kittens above, they could be from 1993 or later, if they aren't the original issues themselves.
 
Versions I've Seen:
Shaggy pale yellow with white
Lion
Grey
White

1992 Kitty Kitty Kittens (Large) 1992 Tyco Industries, Inc. Made in Thailand. The largest of the kittens, approximately 18" long. Make a purring noise when moved.
Versions Seen:
Orange Tiger
Snow Leopard
Spotted Cat (tan with reddish-brown spots, purple ears)
Spotted Cat (tan with black spots)
Cougar? (tan and white cat)

1992 Kitty Kitty Jungle Kittens 1992 Tyco Industries, Inc. Made in Thailand. Slightly larger (the heads, especially) than average Kitty Kitty Kittens, came in jungle prints, with a spandex animal-print necktie. 
1993 Kitty Kitty Kittens (core line).   1993 Tyco Industries, Inc.  Made in Thailand.  Hot Pink writing.
Approximately 10" long, "purred" when head was tilted/body was rocked.  These (esp the one on the left) could very well have been from the "twin" sets shown below. 
1994 Sears Wishbook  Kitty Kitten and Puppy Twin Set, made of soft plush exteriors and each with it's own basket-look box. Kittens come with a collar and mathcing bracelet that can be personalized.  Pick up the kittens and they purr.  The puppies, wiht a gentle cuddle, will wag their tails with delight.  Set of two.
Possibly Puppy Puppy Puppies sold with the "bandana" print neckties are from these sets?
1995 Sears Wishbook Came with an elasticized chiffon necklace, with a plastic heart locket that opened to show a photo of the kitten on the right side, and a space for you to write a name in on the left. 
In my collection:
-Grey & white patches.
-Pale pinkish-tan with white

Kitty Kitty Baby Kittens 1995  Tyco Industries Inc, Made in Thailand (Dark Pink writing).  Smaller than regular kitty kitty kittens.  The heads are about the same size but the torso is much shorter.
1996 Sears Wishbook: Kitty Kitty Kittens Life-like kittens purr when head is tilted to feed. Comes with bottle.  Available at Sears only through the catalogue! Each kitten sold separately.  Sorry, no choice of colour.  Ages 3 years and up. 
These could be any of the kittens listed on my page so far.  I still am not sure how to differentiate them by the year of issue. 

In my collection:
-Calico, white/dark brown/rust
-Calico, white/grey/beige
-White/Black patches
-Pale pinkish-tan with white
-Fluffy white
-tan "siamese"

1996 Kitty Kitty Baby Kittens 1996 Tyco Industries Inc, Made in China. The smallest (and cutest, in my opinion) Kitty Kitty Kittens, they almost had no torso whatsoever!  Came with pink or violet chiffon collars tied in a bow.
In 2000, Kitty Kitty Kittens were made by DSI.  I don't know if Tyco was absorbed into this company or if there was a name change or if the company was completely different; it mattered little as they  had voluntarily recalled over a quarter of a million of them, because the water inside them (to make their bodies more "lifelike" was contiminated and could cause illness to children if they managed to get in contact with said water. Despite this, in March of 2002, DSI announced that they had produced their one millionth Kitty Kitty Kitten, and Puppy Puppy Puppies were introduced at Toy Fair. There were also plans to have a coordinating website promotion with special collector's-only benefits, I do not know if these plans went through or not.  Teddy Teddy Teddies also debuted somewhere around 2003-4, as did the "Soft & Pretty" line (brightly coloured Kitty Kitty Kittens that were difficult to find in stores).  By 2004, DSI was bankrupt.


c. 2002 Kitty Kitty Kittens (Core line) Back of the box features 15 Kitty Kitty Kittens, many are "reused" patterns, others look completely new.  Of these, I have only personally seen 9 (shown below) The 2002 issue kitties were sold in cardboard boxes like these, with a name tag attached to one ear (Beanie Babies have forever changed the landscape of plushie toys I think ;) and sewn-on satin bow ties.  Unlike the Tyco kitties, there was no collar, removable or otherwise.
In my collection:
Pepper, Baby, Punkin, Patches, Sammy, Princess, Smokey, River and Midnight.


c. 2002 Kitty Kitty Kittens (Core line) Laundry tags are pretty vague.  Read made in China, with no manufacturer or date mentioned.  Bodies (if not damaged) feel very light and fat as they have an inflated air bladder inside them. 
In my collection:
Punkin & Patches (according to box back shown above).

2000 DSI tagged kittens.  Laundry tag is marked (in part) 2000, DSI Toys Inc/Meritus Industries Inc. Made in China.  Has the same characteristics as the boxed kittens above, except the bow is made of chiffon with silver dots - also sewn on, no collar at all. 
Two Punkins; Left has the 2000 DSI marked lanudry tag, the other has the generic tag found on the boxed Kitty Kitty Kittens.  The DSI tagged one has a sparkle-dotted chiffon bow tie, the other has a satin bow tie, both sewn right onto the neck.
Pink bow tie Smokey's tag
Two different Smokeys - the one with the mint coloured bowtie is from the boxed series.  The one with the pink bow tie has a different tag.  They are otherwise fairly similar.
Yet another DSI tag

Snowball- looks like the boxed series of kittens but has a different tag.  I am not sure how she was sold.
Burnt Red
Daisy Yellow
Deep Sea Blue
Minty Sea Green
Neon Pink

2002 "Soft & Pretty" Kitty Kitty Kittens Brightly Coloured Kittens with chiffon/sparkle dot "collars".  Mine was bought loose (no box or packaging), with a cardboard hangtag on the ear.  Laundry tag is marked (in part) 2002, DSI Toys Inc.  These appear to be the last of the Kitty Kitty Kittens.  The laundry tags and collars are most similar to the 2000 DSI kittens.

Missing Laundry tags:
 
Mystery Kitty Kitty Kittens: Kittens I have acquired with no laundry tags (they were removed).  They can probably be ruled out as not being the last DSI issues though, as they don't have the sewn on satin bow ties. 
Size differences: Farthest left is the biggest kitty kitty kittens that I've seen at about 18 inches long, middle is a regular-sized DSI, at the end is a Kitty Kitty Baby Kitten -1996 issue, the smallest kitties I know of.
Puppy Puppy Puppies 




1993 Puppy Puppy Puppies 1993 Tyco Industries, Inc.  Made in Thailand.  Dark Pink writing, large tag that mentions washed gravel.
I believe these are the ones that came with the Kitty/Puppy Twin sets, they are wearing spandex bandana collars.  I don't think the ear bows on the white one are original.


1993 Puppy Puppy Puppies 1993 Tyco Industries, Inc.  Made in Thailand.  Dark Pink writing.  The darker beige one is missing his collar, the other two came with polkadot chiffon collars.

These ones have their tags removed.  The sheepdog at the end seems to be a DSI issue, the others are probably Tyco.
1994 Sears Wishbook  Kitty Kitten and Puppy Twin Set, made of soft plush exteriors and each with it's own basket-look box. Kittens come with a collar and mathcing bracelet that can be personalized.  Pick up the kittens and they purr.  The puppies, wiht a gentle cuddle, will wag their tails with delight.  Set of two.
Possibly Puppy Puppy Puppies sold with the "bandana" print neckties are from these sets?

-Shaggy tan fur with white muzzle/undersides.
-Grey/beige/white patches, long ears.
1995 Puppy Puppy Puppies 1995 Tyco Tyco Industries Inc. Made in Thailand. Dark pink (nearly red) writing.
c. 2002 Puppy Puppy Puppies (Core line) Are sold in pale purple boxes with a swing tag attached to the ear. 

Bunny Bunny Bunnies

Versions Seen
Brown and white
Grey lop earred
Tan
White lop earred. 
White lop earred with yellowish spots  

1994 Bunny Bunny Bunnies 1994, Tyco Industries Inc. Made in Thailand.  Purple writing on laundry tag. 

Baby Baby Farm Babies

Versions Seen:
Cow
Pig
Lamb
Horse

1995 Baby Baby Farm Babies 1995, Tyco Industries Inc. Made in Thailand.  Came with a pink/white spandex gingham collar, squeaked when tummies are squeezed.

2002  Teddy Teddy Teddies

Versions Known:

Teddy Bear
Japanese Bear
Polar Bear
Grizzly Bear
Panda Bear
Brown Bear

c. 2002 Teddy Teddy Teddies Filled with an air bladder (like a balloon), they feel very light and make "bear sounds" when rocked (sort of like a higher-pitched version of one of those "moo" can/shaker things).

Tag is the same or close enough as the boxed DSI kitties.