A. skin tumors are common especially in older dogs. There are many types of tumors and for this reason it needs to be checked by a vet. The vet will take and aspiration from one or two tumors (FNA) and will either look under the microscope or send it to the lab if he is unsure. This way you will probably get an answer - are these benign or malignant and the prognosis as well.
A. Lumps on old dogs are quite common. Some can be more cosmetic, fat lumps which are not anything to worry about. Others can be serious as they may be cancerous. These are best to be evaluated by your vet who can (aspirate) take a sample using a needle and see what type of matter is in them and advise on treatment from there
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