Low white blood cell count?

My dachshund went to the vet today. He had no energy, a high temp (104.4) and a very very low white blood cell count. He was given antibiotics and fluids and his fever went away gradually. He has a lot more energy. But his white blood cell count remains very very low. I know my vet is talking cancer. Could it... show more My dachshund went to the vet today. He had no energy, a high temp (104.4) and a very very low white blood cell count.

He was given antibiotics and fluids and his fever went away gradually. He has a lot more energy. But his white blood cell count remains very very low.

I know my vet is talking cancer. Could it be anything else?
Update: Thanks for all your answers. I needed them. I am usually pretty good at research, but am having trouble tonight. I guess because I am so upset.
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