Yes, wolves and domestic dogs can breed and produce fertile offspring. However, dogs have been shaped for human needs in the process of domestication, so that they are different from their wild ancestors in many characteristics.
When one breeds a dog with a wolf, the offspring will inherit a set of genes from each parent, and are indeed 50/50 – that is, one-half dog and one-half wolf.
A coydog is a canid hybrid resulting from a mating between a male coyote and a female dog. Hybrids of both sexes are fertile and can be successfully bred through for generations.
While any dog, especially a hound used for hunting wolves may be loosely termed a "wolfhound", several dog breeds have been specifically bred for the purpose, some of which, such as the Irish Wolfhound, have the word in their breed name.
Short answer: no, they can't. They simply don't have compatible parts. (Of course, that doesn't mean they can't be friends: witness Juniper the Fox and Moose the Dog, above). The longer answer to why dog-fox hybrids can't exist has to do with the two species having vastly different numbers of chromosomes.
The Science of Dog Breeding
Dogs can breed with wolves because they are the same species. So, they are able to make fertile offspring without much issue. Coyotes and dogs have a harder time breeding because a female coyote in heat is quite different than a female dog in heat.
But creating hybrids of animals that are very genetically distinct from each other—such as a dog and a cat—is scientifically impossible, as is one species giving birth to an entirely different one.
They're much bigger, stronger, and more experienced at killing. The biggest key factor in this animal matchup is each species' lifestyle. Rottweilers are domesticated animals, and wolves are wild hunters. Since the wolf practices wrestling, fighting, and hunting, it'll have a distinct advantage over the Rottweiler.
Charging like wild boars or angry rhinos, Rottweilers bring the right type of attitude to a bear fight. They're comfortable controlling their environment with force when necessary. And in this case, they'll use everything they have to take the bear down. Rottweilers have a bite force of 328 PSI.
The chances of a Tibetan Mastiff defeating a wolf in combat is very slim. Despite a Tibetan Mastiff's desire to protect its land and property, a wolf is simply more accustomed to fighting, as they are considered an apex predator.
Jackals are true members of the dog family and can actually interbreed with both domestic dogs and wolves.
Spotted hyenas are more closely related to cats than dogs, despite their dog-like appearance. Their closest relatives are actually mongooses and civets. Unlike all other carnivores, spotted hyenas have a complex social system where animals live in female-dominated clans of up to 90 individuals.
Although it is possible, coydogs in urban settings are unlikely because: Coyotes are highly seasonal breeders; dogs are not. Coydog females have a shifted estrus cycle that does not coincide with the coyote period.
Foxes and wolves may both be in the same broad canine family, but they cannot interbreed and have very little in common.
The Alaskan Malamute is the closest to a wolf in terms of appearance. Further, they may look alike due to the Alaskan Malamute's genetic make-up having extensive crossover with the wolf. This dog breed is loyal, playful, and affectionate with its owners.
1. American Pit Bull Terrier. The American Pit Bull Terrier is considered one of the most dangerous dog breeds – both in the U.S. and internationally. They are a very aggressive breed and have been known to attack and kill people.
So, if the battle occurs among many obstacles and on steep terrain, this will give dingoes an edge. But if the fight is in the open, the much heavier, taller, and longer wolves will be too much for dingoes.
Polar bears, grizzly bears, black bears, and the Siberian tiger will kill and eat wolves. But it's a rare occurrence. Usually, the kills are competitive rather than predatory.
A hyena would win a fight against a wolf. The hyena is faster, heavier, and stronger than the wolf, and those are the only two appreciable differences between these creatures. They're both similar in stature and speed, but the fight would be determined by which creature can deal fatal damage.
Do pets have a sixth sense that enables them to detect pregnancy before humans do? The answer, according to animal behavior specialists, is yes: pets probably can sense pregnancy. But it's not due to a sixth sense—it's their excellent sense of smell.
It is not possible. You can only breed between species if there is some degree of genetic compatibility. Rabbits and cats are not only different species they are different genera as well. Rabbits are lagomorphs (often mistakenly called rodents).
In short, your dog cannot become pregnant when not in heat, but many dog-owners have a hard time identifying and keeping track of when their pet is fertile.