You family doctor in the USA is most cost effective but it also depends on the country you live in
Answer:
Nicotine
Explanation:
Smokeless tabacco may not damage your lungs but still has nicotine so it gives you the same addiction and withdraws when you try to quit.
Are the bumps kinda hard and squishy? If so they could possibly be either fat deposits or tumors. Its always best to get an expert approval so I recommend taking the dog to the vet just to be on the safe side.