One - Coats leaflet 931 - was easy to find, because the cover appeared on screen during the programme. These particular poodle bottle covers could not have been 1950s icons - the leaflet appears to have been issued in 1963 or 1964. (And they are crocheted, not knitted.)
|Emu 8127 - Knitted Novelties|
As in the Coats leaflet, the poodles appear as a black and white pair. The pattern is titled "Poodle Bottle Cover or Toy" - which suggests a lack of conviction that poodle bottle covers are a good idea. The pattern was re-issued in a later Odd Ounce Book, which dates from about 1971 (the price is given both in shillings and in decimal) - the white poodle is promoted to the front cover this time.
|Emu 6359 - Odd Ounce Book|
And again, an Emu Knitted Novelties booklet was issued still later, and was sold at four times the price of the Odd Ounce Book, so possibly late 1970s?
|Emu B.23 - Knitted Novelties|
Judging by these patterns, poodle bottle covers were presented as novelties for using up oddments of yarn, and they date from the 60s and 70s rather than the 50s. Many spinners issued similar booklets to the Emu ones, sometimes with a title like "The Bazaar Book". The patterns include a few small items to wear like scarves, hats and gloves, and things that might be considered useful, like tea cosies, egg cosies, pan holders and soft toys. And there are also similar "novelties" to the poodle bottle cover - toilet roll covers, golf club covers, novelty draught excluders, coat hanger covers. None of these were style icons. I suspect that people often knitted such novelties for charity bazaars because they were quick and cheap to make, and people bought them as gifts when they weren't particularly concerned whether they would be appreciated by the recipient.
I think too that poodle bottle covers would be worse than useless in practice. If you're filling a glass from a bottle, you need to be able to grip the bottle firmly, and the cover doesn't allow that. The Emu cover in particular seems very insecure - the top is elasticated, so that you can get the bottle into it, and it seems to me that the bottle could start to slide out while you were pouring from it. But I am not going to make one in order to find out.