Yay Stella! I'm glad she's rockin' the chemo!

Yep, many dogs are a little tired for the first few days after chemo. That seems normal. if she's eating, drinking and poopin, probably no cause for concern. If anything changes let your vet know.

As for switching food right now and adding supplements, I'm with otisandtess. Definitely wait a bit on the supplements and go very, very slow on that food transition if you can. Especially if going grain-free (click on the link and you'll find our Tripawds Nutrition blog info about it). The theory by vets like Dr. Dressler of the Dog Cancer Survival Guide is that cutting carbs can help fight cancer, because carbs = sugar, and cancer cells love sugar. The less carbs the better. But grain free can be too rich for some dogs, so use care in that transition and of course check with your vet before you switch.

Going through chemo is a time to be extra vigilant should side-effects occur. When food or supplements change, that can complicate trying to pinpoint the cause of any side-effects. Hope that makes sense.