Everyone says theyre seeing my dogs ghost?

she died on july 4th.. my dad said he felt her beneath his legs when he got up from his chair... so he kicked but there was nothing there. my bro saw her p by, my mom heard her barking when she went outside and opened the gate, my sister just screamed a blood curling scream and said she saw her on the couch and when she was in her room she ran out because she felt her walk by and heard her collar. there is no current in my room, i have her collar up on my wall and theres a chinese lantern swinging around! im the only