I am so very sorry. Pets are family members too, and cancer if very scary to face. I cannot confidently give you a recommendation for natural treatment of Laney. I can however provide you with the name and phone number of a company called HomeoPet that specializes in natural remedies for animals. They have knowledge and experience in this area that I simply do not.
Best of Luck & my love to Laney.
HomeoPet
1-800-555-4461
P.O. Box 147
Westhampton Beach, NY 11978