I found a lost dog about 4 months ago and he looks to be pretty old but im not sure.. My family raises boxers and so theres always famales in heat and he is constantly digging holes in the ground to get into the pin with them so i wanna get him spade but dont know how old they can be?
Best to take him to the vet for an evaluation. They will need to do a simple blood test to be sure that he can metabolize the anesthesia properly. If the blood work shows that he is healthy enough for the neutering he should be fine. Neutering is a pretty simple procedure. The anesthesia is the actual risk. The blood work will ad a little more cost but I wouldn't even consider surgery on an older dog without doing it. Good idea to get it done though because he'll never be too old to mate with your girls!