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John, for me to be able to answer you accurately, I'll need to know what those benign lumps are. Has any one of them been biopsied? Are any present that you could photograph and upload a photo to our conversation? You can do so by using the paperclip icon in the toolbar above your message box (if you can see that icon) or you can use an external app such as dropbox.com/
We rarely prophylactically castrate a 10 year old dog. While these tumors are common in old dogs, these dogs are more likely to die of something other than testicular tumors. I wouldn't expect a change in his personality or attitude but you would be likely to see weight gain and a less active dog.