How do i stop crying ovver my dead dog?

I had to put my Dog frodo down 2 nights ago, all i do is cry now. I dont see him laying by his favuorite spot in the house, i dont see him come begg for food anymore when i eat. My other dog probably knows he is gone, or does he? he is going to be so alone without frodo when im at school, btw im 14. I remember the doctor injecting the chemicals in frodo, and him staring into my eyes and in my mothers arms then passing away. I dont know what to do anymoree !! I feel like if i stop crying or mourning over him, that he will think i forgot him, which will never happen. I miss frodo so much. Please help me with things to help me to cope with this problem !! Thank you