Whatever kind of dog you have, you need to make sure that you are using some kind of grooming regime in order to keep the dog’s hair in the best possible condition. This is more important for some breeds of dogs than for others, but all dogs will benefit from at least a little tender loving care from time to time when it comes to their fur. The amount of grooming varies too, but the basic rules remain the same. Brushing at least once a week ensures that knots come out and that the fur isn’t causing any pain - while taking them to get trimmed every few months is good for their ongoing comfort and flexibility. Make sure you don’t overlook this essential, as it really does make a huge difference.
Your dog can suffer mental health issues like any other mammal, and you need to make sure that you are not allowing them to become sad or depressed if you are to really look after them as well as possible. It is actually relatively easy to ensure that your dog does not become depressed; mostly it’s just a matter of keeping them active and feeding them right - and showing them lots of love.
As long as you do that, they should be perfectly happy at all times and you can officially consider yourself a good pet owner as well. See https://www.mentalhealth.org.uk/a-to-z/p/pets-and-mental-health for more on this subject.