Dogs generally get along, but remember, your house is the 9-year-old's territory. He may well try to defend his territory, especially if you he is dominant over you and your family.
Best to let the older dog get the "idea" first by borrowing some of the puppy's toys or bedding and leaving it around your house for the old dog to smell and get used to.
I also recommend putting the pup in a room with the door closed (bathrooms are good for little piddling pups) and lead the older dog to the door so he can get used to the puppy noises, and so forth. If the older dog is going to be aggressive, you may be able to spot it right at this point. In any case, starting with the first step, give your old dog a lot of loving, patting, and "good boy"s, so he won't react as if you are replacing him, or as if the puppy is an enemy intruder.
Good luck with the house training, by the way. (g)
no
Approximately 6 months old.
Dogs mature sexually sometime between 6 months of age, to 8 months of age. It's 100% possible that a 6 month old puppy could impregnate a female dog of any age. The 6 month old puppy needs to be neutered, to prevent a lifetime of "accidents" and unwanted/unplanned litters.
An 8-month-old male puppy is the equivalent of a teenaged boy. He has recently become sexually mature, and his body is very sensitive to physical contact. When you stroke him, he feels pleasure, which can translate into sexual arousal. This is true whether he is intact or neutered. In addition, male dogs in general achieve erection very easily because of the structure of the canine penis. Note: If your puppy is still intact, you may wish to consider having him neutered, unless he is a champion show dog and you want to breed him.
Alice distracted the attention of the puppy that came along by playing with them.
A dog can be neutered any time after eight weeks of age.
A month old puppy is not weined yet. He still needs his mothers milk.
an adult
It may be allergic.
because they have to be neutered or spayed and ready to come home to you.
You can wash your pup any month of the year.
Yes, the pot belly in Labrador dogs is curable for a three month puppy.