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Male puppies that are neutered between 7 and 10 weeks are three times less likely to display behavioral problems, compared to canines neutered at 6 months or older. [60] Most dominantly aggressive dogs are male, which causes many people to neuter their male canine companions.
Older dogs, similar to this 10-year-old Neapolitan Mastiff, often grow grey hairs on their muzzles, and some dogs grow grey hair all over. Not all dogs gain grey hair when aging. Aging in dogs varies from breed to breed, and affects the dog's health and physical ability. As with humans, advanced years often bring changes in a dog's ability to ...
Male dogs can be capable of siring puppies when they are as young as five months, though their fertility will be stronger after a year old. Consult your vet for advice on pet neutering 20.
A puppy is not considered an adult dog until at least a year old. Although toy dog breeds typically mature from around eight months, giant breeds can take up to two years to be fully grown.
Female dogs have their first estrus ("heat") at 6 to 12 months-of-age; smaller dogs tend to come into heat earlier whereas larger dogs take longer to mature. Female dogs have an estrous cycle that is nonseasonal and monestrus, i.e. there is only one estrus per estrous cycle.
A litter consists of the puppies born from the same pregnancy. A whelp is a newborn puppy and giving birth to dogs is called whelping. Dogs commonly give birth in a whelping box, a simple box or pen provided to the dam to help shelter and contain the puppies. A person who intentionally mates dogs to produce puppies is referred to as a dog breeder.
Dogs can have the maternal instincts to start grooming their puppies, consume their puppies' feces, and protect their puppies, likely due to their hormonal state. [124] [125] While male-parent dogs can show more disinterested behaviour toward their own puppies, [126] most can play with the young pups as they would with other dogs or humans. [127]
It is a neurological disease wherein the dog lacks the enzyme galactosylceramidase. The symptoms are noticeable as the puppy develops, and can be identified by the age of 30 weeks. Affected dogs have tremors, muscle weakness, and trouble walking. Symptoms slowly increase until limb paralysis begins to occur.