For many years I had KY Jelly in my whelping kit to grab for taking rectal temperatures, give enemas to puppies and to help ease out stuck puppies.  After all the information came out from Environmental Working Group about the downside of products containing parabens, I ditched the KY and started researching alternatives that were safer.  KY Jelly contains parabens, an ingredient implicated in skin problems and possibly cancer. They made the list of Environmental Working Group's top estrogen mimickers and endocrine disrupters. 

When you consider the bioaccumulative effect of parabens along with the many other endocrine disrupters found in most homes, this is just one more thing I would not want to put into a dog's vagina, especially while pregnant or whelping. I took KY Jelly out of my whelping kit a few years ago and spent years trying to find something safe to replace it.

https://www.scientificamerican.com/.../should-people-be.../

https://www.besthealthmag.ca/best-looks/beauty/parabens/

While there are only 7 ingredients in K-Y jelly {water, glycerin, hydroxyethylcelluose, chlorhexidine gluconate, gluconolactone, methylparaben, sodium hydroxide }- of those ingredients, they…

-can cause skin dryness (exact opposite of what you want) and irritation
-are mildly toxic if ingested
-have been correlated with increased cancers (particularly reproductive organs like breast, ovaries, and prostate)
-contain hormone mimickers, disrupting the endocrine system (hormones, thyroid, adrenals, PMS, etc.)
-decrease fertility and sperm levels

I finally found a great, safe, natural product called Aloe Cadabra that I use in my whelping kit now.  It has a nice slick consistency, is safe to ingest (and you know those moms will be licking it and swallowing it!) and is 100% organic certified.

Ingredients in Natural Organic Aloe (Unscented & Unflavored): Organic Aloe Barbadensis Leaf Juice, Vitamin E Oil (Mixed Tocopherols), Xanthan Gum, Citric Acid, Food Grade Sodium Benzoate, Food Grade Potassium Sorbate , Organic Vanilla Planifolia Concentrate.  There are no ingredients that are cautioned against by Environmental Working Group, not even the glycerine in KY that is implicated in yeast infections.

I don't use petroleum jelly either because it is made from petroleum and has its own set of negative warnings. Aloe Cadabra is our choice for rectal temping, enemas and stuck puppy retrievals.

https://youtu.be/clokjMNeloI