эту пёсу. Grammar check

btotheb gb United Kingdom
Privet vsem

этому псу не находится на кровати

why not "это пёс" не на.....

Is it to do with the word на or находится?

also, is there a sentence in which you could also compse it with the words "это пёс" ?

Thanks in advance!

(edit to fix question)
March 2014