How big can an untreated cancerous tumor get on my senior dog?

Question

My 14 year old Jack Russell was diagnosed with a cancerous sebaceous gland tumor 7 months' ago. We decided not to go through with treatment as he is too fragile and old. So we have been making the most and he has been enjoying his daily routine and still has an appetite and does not appear to be suffering too much. However, we were told things may change from one day to another and that the tumor may rupture. It is larger than a tennis ball wonder how large these tumors can grow? Pet's info: Dog | Jack Russell Terrier | Male | 14 years and 2 months old | 6 lbs

Ana M, DVM · Accepted Answer

Thank you for submitting your question regarding Harvey. There is no way to know how large the tumor will grow. Some seem to grow rapidly and then slow down. Others will continue to enlarge, rupture and keep growing. It sounds like he still has a great quality of life though. This is what matters. Enjoy this time with him!

How big can an untreated cancerous tumor get on my senior dog?

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