I would have it checked out by a vet asap.
I have a 10 year old miniture schnauzer-we have been fighting red mange-now all of the sudden instead of him having two ball sacks he has one very swollen ball sack,it doesn't look red.He doesn't seem in pain,but acts like he's having trouble walking.
Psssst, it's called a "Scrotum".
And yes, a vet trip is in order, this isn't something that can be cured over the internet.
You have not converted someone just because you have silenced them. - John Morley
It could be anything but because you dog is older I would be worried and would run him to the vet to be on the safe side.
Owned by Noodle, Nalla, Squeek, Lucius, and Bella....RIP Hudson my love I miss you.
I agree, vet time.
Yep, vet visit in order. I'm be worried about testicular cancer first and foremost at his age and being intact. I hope it's not it!
If one dream should fall and break into a thousand pieces, never be afraid to pick one of those pieces up and begin again.~Collar of Hope~