Realistically, you're likely to pass it to another layer and never get it back, granting your opponents an advantage, which is always a bad idea
Look for special markers when youre browsing ultra rare pokemon cards for sale: Modern sets use specific terms like SIR (Special Illustration Rare), Alt Art, Secret Rares (numbered beyond the set count), Hyper Rares (rainbow cards), and Gold cards
Also, this card is excellent to send to the Lost Zone if you didnt use it on your first turn
Yes, hounds are considered dogs in MTG
If you are considering selling your cards to a store, expect a much lower price than the retail price as stores would typically only pay between 30% and 60% of the retail value of an item