Question: My dog has A pea sized lump at the bottom of each testicle at the same spot ?
I am wondering if this is normal or should I take him to the vet
It's probably the cauda epididymis, which is involved in increasing the concentration of sperm in the ejaculate. Get him checked if either one changes in size.
One good reason to castrate your dog. They can get testicular cancer. Take it to the vet, it could be nothing serious but better safe than sorry.