You are most welcome! And you can give Pax a cuddle and a kiss for me too.
Hopefully you will hear from Lilspaz soon!
My information may not be accurate either, so a second opinion from her will be great. I may be wrong on beef/meat ingredients in baby food having too much protein, so we will see what she says. My opinion may just be coming from the fact that I have always fed my babies vegetable and fruit based baby foods.
Another idea I had for some soft, easy to eat/digest options for Pax would be rolled oats softened up with some warm water (a ratty oatmeal of sorts!) and/or Gerber Baby Rice Cereal, which you also add some warm water to and it makes a nice creamy soft cereal mush.
I actually feed both of these items to my two rat boys (even though they are not elderly or under the weather, and they are too pudgy, heh heh) but basically because they LOVE the taste of oatmeal and rice cereal, as just about any rat does....but those both seem like some good options that Pax should find delicious and they are filling. That and of course the Ensure option. Ensure may end up being the Gold Medal Winner for under the weather/sickly ratties?
But, again, I will let Lilspaz see what she has to say about all my advice! If I gave any incorrect advice, she will let you know!
Kisses to your Pax and I hope he starts to feel better soon? Sounds like you have great support from your parents with trying to help Pax, and that is always so wonderful.