ANSWER
I have had multiple dogs in my lifetime. I have NEVER seen anything but good come from having a dog fixed. Specifically, I'm thinking of my last three dogs, an Old English sheepdog who was unaltered at 5 years of age when I got him. I immediately had him fixed. He was the best guard dog I ever had! Also, my labrador, who I had fixed at 4 months of age. He is a fantastic guard dog! I have no doubt that he would kill anyone who tried to harm me. I also have a Britney Spaniel who was a wussy, lovey dog when I got him, had him fixed, he's still a wussy, lovey dovey dog. It has more to do with the personality of the dog than anything else.
if you mean a dog being spayed or neutered, No they do not get mean, only people make dogs and cats mean!!
On the contrary, it generally makes male dogs less aggressive. He might be ticked off for a while, but then he'll forget.
They still may have the urge after being fixed if the female is in heat, or goes into heat. Just because the male is fixed, doesn't mean he has lost the urge, or can't do it any more. All that has been removed is his nuts and sperm. Therefore, the male and female can still mate and get locked up, but can not get pregnant unless it is recently after the male has been fixed and he still has a little bit of sperm in his system.
There is no easy way to stop dogs from sniffing each other as this is the way dogs find out information about things. A male dog does not go into heat. Only female dogs do.
Yes, they cut the dogs balls off... not his penis.
If you mean, Can dogs be male or female? Then the answer is yes. They can be both.
female dogs are 'bitches', male dogs are just 'dogs'
Yes. Only the testicles on the male have been removed, not the penis. Penetration will still happen, as the male dog can still maintain an erection. There is just no sperm production. Indeed, neutered male dogs can maintain an erection, penetrate a female and actually achieve orgasm, and will "tie" with the female. Most neutered males are less interested in sex due to lowered testosterone levels, but still capable of all the actions. They simply do not produce sperm and cannot impregnate a female.
Some female dogs get Pyometra, a disease of the uterus. It will make their organs fill with pus and they will rupture. Get her fixed. Also, your male dog is fixed, so it should be fine, if you notice a lot of humping, separate them if necessary.
it is to show dominance over the other dog.
It means that someone cannot give sperms (boys) or have children (girls) as for dogs like in Marley and me they had him fixed or nudered and for giril dogs they will be spayed wich is like nuder but is for a girl.
No, after being spayed, fixed adult female dogs no longer go into heat because the surgery removes their reproductive organs, including the ovaries which produce hormones responsible for the heat cycle.