Experienced and professional animal trainer provide their insights in answering this question :
A. Interactions whenever a new pet is brought into the house should start off slow, then can be increased in time. The best steps when introducing a new cat is to allow your cat or kitten to have a room in the house all to him or herself. Allow your dog to sniff under the door to get used to the kitten’s scent, and even show your dog articles such as bedding the cat has slept on. After a few days, an introduction with your dog on leash, or a barrier such as a gate where both pets can look at each other but not see each other is best. This will allow each to get used to seeing the other without the ability to jump, bite or scratch the other. Once the two are used to this, then a face to face interaction can begin. If at any time a fight or scuffle breaks out, separate the two pets and try again at a later time. The amount of time this introduction takes can vary depending on how the two react to each other.

Until your kitten is older, or you are sure both are fine together, do not leave the two pets together unattended. Even a well-meaning and playful dog can accidentally break a leg of a kitten or worse without meaning to! A safe room for your kitten to be in while you are away, or a barrier to allow your kitten to escape to safety if needed will help until both are big enough to play alone safely.

How to Identify Common Pet Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced pet care professionals :

While there are some parings that work out in days, in some rare cases, it never works out. Liz Palika noted that, in her experience, the “get acquainted” process usually takes two to three weeks. Dr. Landsberg noted that sometimes it`s not easy to tell by their interactions if a dog and cat are getting along or not.
All dogs have the potential to hurt a kitten so, before allowing face-to-face introductions, you`ll need to backtrack a few steps and introduce something called `impulse control`. This means helping your dog to be calm in exciting situations, rather than reacting immediately to them.
It`s helpful if your kitten`s breeder or rescue centre can get them used to dogs during their `socialisation window` between two and eight weeks old.
If a dog attempts to aggressively chase, pin, pick up or otherwise “manhandle” any cat, it is best to not even consider getting a cat — or at least to proceed with caution. Additionally, a dog who growls, lunges at or obsessively barks at a cat would probably do best in a cat-free environment.
Even when pets are spayed or neutered, opposite-sex animals tend to get along better than those of the same sex. Are you bringing a dog into your older cat`s happy home? A cat and a dog can absolutely be best friends, but you have to help them build a relationship slowly and carefully.
Like with cats, separate your kitty and your dog for the first few days, keeping your kitten in their “safe zone” while the dog gets used to their kitty smells underneath the door. Once your dog is ready, allow them to see your kitty through a baby gate or other barrier.
The majority of cats can happily coexist with a dog if they are given time to comfortably get to know each other. If a puppy and kitten are raised together, they generally will learn right away to tolerate each other, and some cats and dogs grow to be real friends, even playing and napping together.
Where should my kitten sleep on the first night? In the first few nights, have your kitten close to you in a warm and cosy spot next to your bed. Kittens like to feel sheltered and secure so putting them above the ground, if possible, can also make them feel safer.
In the most general terms, though, the best strategy would be to adopt first a middle-aged, well-mannered dog who shows little interest in cats, and then a kitten who has been raised in a household with friendly or indifferent dogs around.
If your dog has a strong prey drive, he might become very focused on the cat. (A prey drive is the inclination to seek out, chase and potentially capture animals seen as prey — usually smaller animals such as cats or rabbits.) He`ll stiffen, stare, glare, and may start barking or whining.
It was concluded that relationships with cats are better because the perceived cost of such a relationship is lower. However, emotional closeness is greater with dogs than with cats.
Domesticated dogs have generally been bred to be easy-going and loving toward most animals, so many dogs will happily welcome a cat, rabbit or other animal into the home. But some dogs will still resort to their wild natures and try to threaten or harm new animals in the home.
The short answer is, yes, dogs and cats living together usually have no issues. However, it`s important to note that for them to coexist peacefully, it can take some work. Taking introductions slowly and making adjustments to your home and routine so that both pet`s needs are met can make all the difference.
Many dogs can live peacefully with cats, often forming a close relationship where they can even sleep together and clean each other. But this is not always the case – not all dogs and cats can live together.
Introduce on neutral territory.

Each dog should be walked separately on a leash, and each walker should have a bag of high-value treats or food broken into small pieces. At first, walk the dogs at a distance where they can see each other but are not too provoked by each other`s presence.

Harris said that while anecdotal accounts tell of dogs being jealous of partners, cats and babies, the animals` jealousy is thought to be primordial and similar to that seen in babies.
Introduction. Dogs are extremely loyal members of the family and just like humans they can experience a variety of different emotions – including jealousy. This can especially be the case when someone new becomes a member of the family, such as a newborn baby and seems to get all the attention and affection.
Kittens younger than six months are developing rapidly both mentally and physically and crave a strong bond with their humans. Being separated from them for long periods leads to loneliness and anxiety, resulting in various health and behavioural problems.
Should the light be left on or turned off? Remember, cats can see in the dark a lot better than you or I can, so your kitten will have no problem finding what they need, even in minimal light. However, you can leave the light on or provide a night light on the first night while they adjust to their surroundings.
In general, cats are tidier, easier to care for, cost less (usually!) and are more independent, while dogs are more expensive and demand more time and attention, as well as sometimes being more affectionate.
Introducing your puppy and kitten early in their lives is a great start to helping them get used to one another, the way you introduce them is important too. During your kitten and puppy`s first introduction to one another, you should make sure they can see one another, but each has their own personal space too.
Rushing the introduction.

Your new pet needs time to feel comfortable in their environment and the resident pet will have to adjust to their presence. Even if your cat is a natural with dogs, or your dog already has feline friends, it is best not to start with a face-to-face meeting.

In some cases, the dog will lose interest in the cat within a couple of hours. But it can take days, weeks, or even months. Each dog (and each cat) is an individual and will learn at their own pace. It is possible that your dog might not ever be able to safely share space with a cat.
You should allow the cat to choose whether they approach the dog/puppy or not. They may hiss or growl but if no interaction is forced they are unlikely to advance and if they do you can protect your dog or puppy from any aggressive advance.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Q. I have a 1yr old male 38 lb Labradoodle and my gf just brought a month old kitten home. Can they interact? If not, for how long?
ANSWER : A. Interactions whenever a new pet is brought into the house should start off slow, then can be increased in time. The best steps when introducing a new cat is to allow your cat or kitten to have a room in the house all to him or herself. Allow your dog to sniff under the door to get used to the kitten’s scent, and even show your dog articles such as bedding the cat has slept on. After a few days, an introduction with your dog on leash, or a barrier such as a gate where both pets can look at each other but not see each other is best. This will allow each to get used to seeing the other without the ability to jump, bite or scratch the other. Once the two are used to this, then a face to face interaction can begin. If at any time a fight or scuffle breaks out, separate the two pets and try again at a later time. The amount of time this introduction takes can vary depending on how the two react to each other.

Until your kitten is older, or you are sure both are fine together, do not leave the two pets together unattended. Even a well-meaning and playful dog can accidentally break a leg of a kitten or worse without meaning to! A safe room for your kitten to be in while you are away, or a barrier to allow your kitten to escape to safety if needed will help until both are big enough to play alone safely.

Read Full Q/A … : Dogs and Jealousy

Q. I recently added a new 2 month old female kitten to my house and my male 5 month the old kitten has turned aggressive and chases the kitten down..
ANSWER : A. It is possible it could be play behavior but without seeing it in person, hard to say. Is the male kitten neutered? You may want to consider doing so. Also, try re-introducing the kittens slowly by creating a safe space for the new kitten behind a closed door in a room. Keep her there for at least a week so she is protected but your male is still able to smell her. After a week or 2, you can then graduate to using a baby gate so they can then not only smell each other but safely see each other as well. If that is going okay, after another few days you can bring the gate down. Also, be sure to have feeding bowls in separate locations and at least 2 litter boxes.

Read Full Q/A … : Ragdoll Cats

Q. When Yoz Start Holding The Kittens. When Can They come Out Of Thr Birthing area?
ANSWER : A. As long as you wash your hands, and make sure you are very clean and not sick, you can interact with the baby kittens right away. You want to be handling them often so they get used to people handling them! Do not allow them out of the birthing area until they are at least a month old I would say. You want to get them checked out by vet, but make sure you bring them in a cage. They should at least have had their first vet check-up before being allowed out of the birthing area to roam around your CLEANED home. Clean your home very well, with products like SIMPLE GREEN so they are safe to roam. Do not allow them outside, and do not allow them to interact with other animals until they have all had their shots. When people come over to hold/interact with them, make sure they wash up very well, and ask about the pets they have at home.. make sure they don’t have any sick pets, or any pets who have ever had PARVO.

Good luck with the babies!!

Q. My female cat seems depressed since I brought home my male kitten from being neutered yesterday. She is sleeping alot.
ANSWER : A. It is possible she was/is upset or disturbed by the unusual odors on your male kitten from the veterinarian’s office. Or she was content to be an solo cat. Unless her depression persists more than a day or two, she stops eating or using the litter box, or other symptoms develop such as vomiting, diarrhea, fever, she is probably fine and should get over it. If any of the symptoms mentioned develop, her depression may be unrelated to your male kitten’s return, and a trip to the vet is warranted.

Q. We brought 2 new kittens home. One of them is sneezing. We have a Sr cat and an adult who is now coughing. What to do?
ANSWER : A. Commonly respiratory infections (viral -Herpesvirus and Calicivirus- and possibly bacterial) can cause sneezing episodes in kitten especially if not vaccinated yet. If your kitten is affected by respiratory infection could develop or have more signs such as discharge from eyes, more discharge from nose, coughing, being lethargic, depressed and inappetent.

The coughing episodes of the adult cat could be completely unrelated to the cause of sneezing of your new kitten, especially if your adult cat is already vaccinated.

The cause of cough in adult cats are not necessarily related to respiratory problems, heart problems could cause that as well.

Keep the nose and the eyes of your kitten free from discharge, keep your kitten warm and take both of them to your veterinarian as soon as possible to identify the cause and the relationship of the two problems and treat appropriately.

Q. Our 8yr old cat does not get along with our 5 month old kitten. It was fine for a while now all he does is hiss at her even from across the room.
ANSWER : A. This is a common occurrence when a young kitten is introduced to an older, established cat. It may take time or may change once the kitten is spayed or neutered. Calming pheromone collars or sprays may be effective in decreasing the anxiety/aggression in the home until the older cat accepts the kitten. Search www.pet360.com for pheromone products.

Q. Why is my 5 month old kitten biting and removing the 1 week old kittens from their box?
ANSWER : A. You should have one litter box for each cat ( or group of cats, that live together in good terms like kittens in the same age) plus one extra litter box in your home. Boxes should be also localised in different places in the house like in different rooms or corners of one room. In your case 5 month cat can “think” that all litter boxes are his, so he removes rivals from them.

Q. I have a 9 week old kitten. At what age do they start spraying? We have a 12 yr old cat that has sprayed a door, I think. Could it be the kitten?
ANSWER : A. It is not unusual for an established house cat to start acting out once there is a change in his environment. In this case, the new kitten could be a stressor for the older cat as he tries to get used to the new change of an added house member. To answer your question, cats generally do not start spraying until the are around 5-6 months old.