Excuse me, what is a string of dogs and what does it mean?

Cross-border dogs are the general name of all hybrid dogs or dogs with inconspicuous breed characteristics, not specific dog breeds. Although it is a hybrid, it is usually higher in IQ, stronger in antiviral ability and lower in morbidity than purebred dogs because of its hybrid advantages. Lively and cheerful personality, smart and healthy, alert, very loyal, has its own unique personality. Generally, strings are very resistant to diseases. Although they can't take part in the dog show competition, which is usually called the dog body competition. But you can participate in agile competitions or speed races.