Discussions

K so here is my problem. We got our dog nuetered and dew claws removed last week. Well first d/h noticed a foul odour a couple days ago, last night I myself could smell it as well.  
 
I went up close to our dog and I swear his bottom smelled like rotton meat that had been left in the sun for far too long.  
I took him to the vet today, thinking that he had gotten infection in his scrotum from the neutering, but she is saying its not infecion, yes he has fluid build up in there, but nothing to be concerned about. Supposedly its anal glands. I have had dogs all my life and never ever had a dog who smelled like that ever. What the heck is with anal glands and how do i make sure that smell doesnt happen again? And how can i be sure its not going to lead to a bigger problem down the road?