Something is grown if it has finished growing and reached its full size, or has been growing for some time. The dog in the picture is fully grown.
A mongrel is a dog that you cannot tell what breed it is. Mongrels might simply be cross breeds, but are usually stray dogs that have been mixed breed for so long there is no way of telling what their ancestry is.
A pet is an animal that is kept entirely for fun or as a friend. Pets are usually small animals, like cats, parrots or dogs. Animals are often kept for other reasons, like for their meat, their wool or to help herd other animals around. For example, cows are generally kept on farms for their milk, not as pets.
Most animals have tails - people and apes don't. A tail is just an extension of the animal's backbone. Animals use their tails to communicate - dogs wag their tails when they are happy, cats wave their tails when they are angry and put their tails straight up to say "hello".
Animals like cows and horses use their tails to swat flies away. The kangaroo has a big, heavy tail that it uses to balance itself when it hops.
The Australian kelpie is a medium sized dog that was bred to herd animals like sheep, cows and goats. Kelpies come in a range of colours but the most familiar one is a reddish-brown coat. Kelpies are very energetic and are only suitable to be kept as pets by people who have a lot of time and space to exercise them. Bored kelpies can be noisy and destructive.
A race is where two or more people or animals try and take the shortest possible time to travel a set distance. The winner is the fastest. There are lots of different kinds of race. The picture is of some people racing each other on bicycles, but there are also horse races, dog races, running races, car races and of course anything that can move can be raced.
A person from Denmark is called a Dane.
Dane is also a male name.
You might also be looking for the great Dane dog.
Bled is the past tense of bleed, for example "our dog bled on the carpet".