Dog lovers will appreciate this … New York Mets catcher Tomas Nido just showed major love to his adorable pup — by getting a tattoo of the canine on his leg!

Baseball player wanted to get some ink to celebrate his beloved pet last week … so he hit up artist Keith Hernandez from Bang Bang Tattoo in New York City.

We’re told the 27-year-old handed over a portrait of his Yorkie, Louie, that he got 8 years ago … and Hernandez then went to work.

The artist took a few hours to do the piece … and it all ended up coming out pretty incredible!!

Check out the details … the drawing of Louie — which will now sit on the inside of Nido’s shin forever — looks SUPER real, right down to the fluffy hair and little dog outfit.

We’re told Nido got one more tat while he was in the shop … getting the letter “E” inked behind his ear — a shoutout to his 8-month-old daughter, Eleni.

In total, Nido ended up sitting in the chair for about 3 or 4 hours … and we’re told he’s planning to head back to the shop in the near future to get more ink done.

In the meantime … can you can spot Louie on Nido during the next Mets game broadcast??