I'm sorry to hear that your Lab is having this issue. As you mentioned that this growth changed in dimension when you pressed on it, it would be advisable to have your vet take a look. Older labs can be prone to a few things. Tumors (both benign and otherwise) are one, but another less serious issue is something called a lipoma. Lipoma's are (generally) harmless fat deposits that can at times change shape. Consider having this looked at by your vet to know which it is for sure. If you do not have a vet, contact your local SPCA. These often have sliding scale clinics or can refer you to one. I hope he's doing better soon.
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