How can I get rid of a dog that's followed my dog home?

Hi my dogs on heat and last week wen I had hur out a dog came from no were and ended up following us home even no I shouted at it n chased it now every time I take my dog out this dog comes from no were no matter the time its been there at day and nite and I need to take my dog in doors as this dog just doesn't leave I chase it it just come back n back again this has been happenin for a week now how can I get rid of it . Sum one I know feed the dog and was planning to call in the pdsa but the dog went for them so I'm not trying that one and it's only there 10-20 min thn gos away n come back wen ever