looking for the reason
"basically she goes off all food (turns her head away), spends all the time lying down (I call it sphynx laying as she is 100% square), she often takes hersefl off or stares at walls"
might be some intestinal discomfort , crouched position indicating pressure or tension ,and she is internalizing , waiting for the discomfort to pass .
how would you adjust her diet ?
when the spleen is removed the liver has to take over its filtering function so you may want to ask your vet about liver supportive supplements such as glutathione boosting undenatured WHEY (goat/bovine) , NAC N-Acetylcysteine
Lysine (NOW has a double strength) , sources of selenium (could be one ground brazil nut) , alpha lipoic acid (health food store) and also to help the liver in its function , cleansing milk thistle seed , dandelion , burdock, bile stimulating peppermint, nettle leaf and beneficial turmeric.
to stimulate appetite warm the food slightly to blood temperature , use a little bit of garlic .
think about making a big pot of bone broth which will give you glycine and proline, minerals and so many other benefits .
the dog had some pretty major surgery and I wouldn't doubt a course of antibiotics afterward, when the dog was at an advanced age so bounce back would be slower.
something to restore the gut flora so that the nutrients are absorbed would be helpful.
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