If Drake and Josh had only told Dr. Glazer not to mention the sheep to their parents, that doesn't mean that they can't ask him about it. Drake and Josh should have asked him, because Megan even said to him it was her sheep.
When the boys parents find the sheep in their room, the lamb that Drake is holding repeatedly changes position. In one shot it is facing left, the next it's facing right, the left again. This happens several times throughout the scene.
Josh: Well, come on, Bob.
Drake: (serious) Hey, hey, hey! His name is Baaaab. (Josh sprays deodorant in his face)
Josh: Where'd you get the sheep?
Megan: I bought him on the internet.
Josh: Well, excuse me for not being familiar with SHEEP STORE DOT COM!
Josh: We better go wake up Dad.
Drake: Yeah, good idea, Josh, but I don't think a robber's gonna be afraid of a weatherman wearing footsie pajamas.
Walter: I keep hearing this pinging sound from the-
Josh: (After seeing sheep in garage Yaaaaaah!
Josh: I'm just... so alarmed by the pinging sound your car is making.
Drake and Josh: (After noticing Baaab in the kitchen) Yaaaaaa!
Drake: Something in my eye!
Josh: Somethin' in his eye!
Audrey: Let me take a look.
Drake: Yes, yes, you look.
Josh: And I'll (Looking for excuse to go into kitchen) ... go make smoothies!
Drake: Do you know what it's like to go 2 weeks without girls?
Josh: Yes. Yes I do.
Josh: Moca Cola!? You're gonna feed soda to the baby sheep!?
Drake: Diet soda.
Baby sheep: Baaaaa.
Drake: Yeah, I know.
Dr. Glazer: Yes, well I am not a vet, but if you want my diagnosis, I'd say that Baaab was pregnant. Was. Pregnant. That's 100 dollars.
Megan: Aww, look at the baby! Aww.
Drake: All right, we'll pay you 100 bucks, but can you do us a favor and -
Josh: (Continiued) Not mention this to our parents?
Dr. Glazer: Fine. 150.
Dr. Glazer: (Reluctantly) All right. Bring the Wheat Squares.
Josh: For the sheep?
Dr. Glazer: No, I'm hungry.
Dr. Glazer: (To Drake) You told me your father fell down the stairs again.
Drake: Well, if you just go and check on the sheep, I promise I'll push him down the stairs later.
Megan: (Angry) What took you so long?
Dr. Glazer: I was eating my Wheat Squares.
Josh: Baaab left me a little surprise in my bed.
Megan: Aww, good Baaab.
Megan: Drake, can you help me with something?
Drake: I can't, I'm doing my homework.
Megan: You're watching TV.
Drake: Well, that explains why I;m failing math, doesn't it?
Audrey: Now why would there be smoothie stuff in the garage? (Turns around)
Drake: (Quickly) Ow, ow, my eye, oh, the pain!
Drake: Uh oh. Soumds like smoothie trouble. Be back in a sec.
Audrey: (Long pause) Smoothie trouble!?
Megan: See this boombox?
Megan: It's not really a boombox.
Josh: Where did you get sheep named Bob?
Megan: His name isn't Bob, it's Baaab!
Drake: Did you heard that? His name isn't Bob, it's Baaaab. (Josh stares at him)
Josh: ...I have ears.
Megan: If I was gonna pull the prank on you, would I tell you about it?
Drake: Well, no. I guess not.
Megan: See, it's fun to use your brain.
When Audrey was knitting, she was using yarn. Yarn comes from sheep.
Mountian Fizz: A spoof of Mountain Dew.
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