If Taylor has 4 pets, and each of his first friends brings twice as much, the total for each friend is 4*2 = <<4*2=8>>8 pets.
The total number of pets for Taylor's first friends is 8*3 = <<8*3=24>>24 pets.
The other two friends brought two pets each, a total of 2*2 = <<2*2=4>>4 pets.
The total number of pets will be Taylor's pets plus his friend's, which is 4+4+24 = <<4+4+24=32>>32 pets
#### 32