Irrespective of the intention and the number of times, if your pet dog mates with another dog, you are likely to fall under the category of an illegal breeder and may be liable for penalties and punishments under the Prevention of Cruelty to Animals Act of 1960. These could include the seizing of your pet dog and the newborn puppies by the State Animal Welfare Board and the SPCA. Suppose such mating comes to the knowledge of the State Animal Welfare Board, animal welfare activists or the municipal corporation. In that case, there is a possibility that strict action may be taken under the laws mentioned above, in addition to certain other laws.
The sale of puppies may also make you liable for contravention of the Pet Shop Rules, Shops and Establishment Rules and additional penalties thereunder. Hence, in such cases, it may be prudent to inform the concerned unit of your municipal corporation and the State Animal Welfare Board or the Honorary Animal Welfare Officer, who may suggest the appropriate protocol to be followed in cases of accidental dog mating.
Further, in cases of accidental mating, the pet parents may not be in a position to see through the adoption of multiple puppies into the right families. Hence, it may be beneficial for the puppies to follow the SPCA adoption formalities. Irrespective of whether the other dog is known or unknown, it may be best to consult your vet in such cases, especially for female dogs.